create CONTRIBUTING.md

Author: akamhy

CONTRIBUTING.md

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+# Welcome to waybackpy contributing guide
+
+
+## Getting started
+
+Read our [Code of Conduct](./CODE_OF_CONDUCT.md).
+
+## Creating an issue
+
+It's a good idea to open an issue and discuss suspected bugs and new feature ideas with the maintainers. Somebody might be working on your bug/idea and it would be best to discuss it to avoid wasting your time. It is a recommendation. You may avoid creating an issue and directly open pull requests.
+
+## Fork this repository
+
+Fork this repository. See '[Fork a repo](https://docs.github.com/en/get-started/quickstart/fork-a-repo)' for help forking this repository on GitHub.
+
+## Make changes to the forked copy
+
+Make the required changes to your forked copy of waybackpy, please don't forget to add or update comments and docstrings.
+
+## Add tests for your changes
+
+You have made the required changes to the codebase, now go ahead and add tests for newly written methods/functions and update the tests of code that you changed.
+
+## Testing and Linting
+
+You must run the tests and linter on your changes before opening a pull request.
+
+### pytest
+
+Runs all test from tests directory. pytest is a mature full-featured Python testing tool.
+```bash
+pytest
+```
+
+### mypy
+
+Mypy is a static type checker for Python. Type checkers help ensure that you're using variables and functions in your code correctly.
+```bash
+mypy -p waybackpy -p tests
+```
+
+### black
+
+After testing with pytest and type checking with mypy run black on the code base. The codestyle used by the project is 'black'.
+
+```bash
+black .
+```
+
+## Create a pull request
+
+Read [Creating a pull request](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
+
+Try to make sure that all automated tests are passing, and if some of them do not pass then don't worry. Tests are meant to catch bugs and a failed test is better than introducing bugs to the master branch.