Add contributing information (CircleCI-Public#88)

Author: BytesGuy

.github/CONTRIBUTING.md

@@ -0,0 +1,35 @@
+# CircleCI Docker Convenience Image Contributions
+
+We welcome all contributions to our CircleCI Docker Convenience Image repositories from the community!
+
+This file outlines best practices for contributions and what you can expect from the images team at CircleCI.
+
+## Image Support Policy
+
+For our official CircleCI Docker Convenience Image support policy, please see [CircleCI docs](https://circleci.com/docs/convenience-images-support-policy).
+
+This policy outlines the release, update, and deprecation policy for CircleCI Docker Convenience Images.
+
+## Issues
+
+Please open issues for feature requests and bug reports. Depending on the type of issue, please fill out the issue template with as much information as possible.
+
+The more information you can provide about your issue, the better we can help address the issue promptly!
+
+For feature requests, in order for us to add a tool within the image, it has to be something that is maintained and useful to a majority of CircleCI users. Every tool added makes the image larger and slower for all users, so any new additions need to be carefully thought out.
+
+While we make every effort to respond to issues quickly, however please note that we do not provide an official SLA for this.
+
+## Contributions and Pull Requests
+
+When making changes to CircleCI Docker Convenience Images, please only make these changes in the `Dockerfile.template` file in the root of the repository.
+
+Our build and releases scripts generate new Dockerfiles based on the `Dockerfile.template` file and overwrite the Dockerfiles in the version directories. Therefore, only changes made to the `Dockerfile.template` file will be valid for a pull request as changes to other files will be lost.
+
+Additionally, please do not make changes to any of the build or push bash script files as these are also automatically generated.
+
+Ensure extra layers are not added to the Dockerfile where it is not necessary. We aim to keep layer count low to ensure good caching in the CircleCI execution environment.
+
+Please fill out the pull request template when opening a new pull request. This helps us to look into new pull requests in a timely manner.
+
+While we make every effort to respond to pull requests quickly, however please note that we do not provide an official SLA for this.

.github/ISSUE_TEMPLATE/cimg-bug-report.md

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+---
+name: Bug Report
+about: Create a bug report for this image
+title: 'Bug Report: <BUG>'
+labels: 'bug'
+assignees: ''
+
+---
+
+*Note: We also welcome PRs to fix bugs! This helps us take action faster where a bug has been identified!*
+
+For our official CircleCI Docker Convenience Image support policy, please see [CircleCI docs](https://circleci.com/docs/convenience-images-support-policy).
+
+This policy outlines the release, update, and deprecation policy for CircleCI Docker Convenience Images.
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please provide steps to reproduce the behavior, such as a sample job or config file.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Workarounds**
+Are there any current workarounds for this bug that can be used currently?
+
+**Screenshots and Build Links**
+If possible, add screenshots and links to jobs to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/cimg-feature-request.md

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+---
+name: Feature Request
+about: Create a feature / enhancement request for this image
+title: 'Feature Request: <FEATURE>'
+labels: 'enhancement'
+assignees: ''
+
+---
+
+For our official CircleCI Docker Convenience Image support policy, please see [CircleCI docs](https://circleci.com/docs/convenience-images-support-policy).
+
+This policy outlines the release, update, and deprecation policy for CircleCI Docker Convenience Images.
+
+---
+
+**Describe the Feature Request**
+Please describe the feature request.
+
+**Is your feature request related to a particular problem?**
+A clear and concise description of what the problem is.
+
+**How will this feature request benefit CircleCI jobs using this image?**
+For example, will it help speed up jobs significantly by not having to install a commonly used package every run?
+
+In order for us to add a tool within the image, it has to be something that is maintained and useful to a majority of CircleCI users. Every tool added makes the image larger and slower for all users, so any new additions need to be carefully thought out.
+
+**Describe the solution you would like to see**
+A clear and concise description of what you would like to see for this feature request. For example "I like like to see xyz package installed by default in the image".
+
+**Describe alternatives you have considered**
+A clear and concise description of any alternative solutions you have considered, such as different packages or workarounds.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: CircleCI Discuss Community Forum
+    url: https://discuss.circleci.com
+    about: Community forum for CircleCI users

.github/pull_request_template.md

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+For our official CircleCI Docker Convenience Image support policy, please see [CircleCI docs](https://circleci.com/docs/convenience-images-support-policy).
+
+This policy outlines the release, update, and deprecation policy for CircleCI Docker Convenience Images.
+
+---
+
+# Description
+A brief description of the changes in this PR.
+
+# Reasons
+Please provide reasoning for these changes and how this PR achieves them.
+
+If applicable, include a link to the related GitHub issue that this PR will close.
+
+# Checklist
+
+Please check through the following before opening your PR. Thank you!
+
+- [ ] I have made changes to the `Dockerfile.template` file only
+- [ ] I have not made any manual changes to automatically generated files
+- [ ] My PR follows best practices as described in the [contributing guidelines](CONTRIBUTING)
+- [ ] (Optional, but recommended) My commits are [signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)

README.md

@@ -14,6 +14,9 @@
 
 `cimg/postgres` is a Docker image created by CircleCI with continuous integration builds in mind.
 
+## Support Policy
+
+The CircleCI Docker Convenience Image support policy can be found on the [CircleCI docs](https://circleci.com/docs/convenience-images-support-policy) site. This policy outlines the release, update, and deprecation policy for CircleCI Docker Convenience Images.
 
 ## Table of Contents
 
@@ -216,12 +219,9 @@ Don't forget that to see any of these changes locally, the `gen-dockerfiles.sh`
 
 ## Contributing
 
-We encourage [issues](https://github.com/CircleCI-Public/cimg-postgres/issues) and [pull requests](https://github.com/CircleCI-Public/cimg-postgres/pulls) against this repository. In order to value your time, here are some things to consider:
-
-1. We won't include just anything in this image. In order for us to add a tool within the PostgreSQL image, it has to be something that is maintained and useful to a large number of PostgreSQL users. Every tool added makes the image larger and slower for all users so being thorough on what goes in the image will benefit everyone.
-1. PRs are welcome. If you have a PR that will potentially take a large amount of time to make, it will be better to open an issue to discuss it first to make sure it's something worth investing the time in.
-1. Issues should be used to report bugs or request additional/removal of tools in this image. For help with images, please visit [CircleCI Discuss](https://discuss.circleci.com/c/ecosystem/circleci-images).
+We encourage [issues](https://github.com/CircleCI-Public/cimg-postgres/issues) and [pull requests](https://github.com/CircleCI-Public/cimg-postgres/pulls) against this repository.
 
+Please check out our [contributing guide](.github/CONTRIBUTING.md) which outlines best practices for contributions and what you can expect from the images team at CircleCI.
 
 ## Additional Resources