PR template update, CLA is automated now [skip ci]

Author: diemol

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,4 +5,34 @@ For the time being the team will support both the extension and the app, until t
 If you want to submit a PR to the electron app, please submit to master.
 To submit a PR to the extension submit to the branch v3
 -->
-- [ ] By placing an `X` in the preceding checkbox, I verify that I have signed the [Contributor License Agreement](https://github.com/SeleniumHQ/selenium/blob/master/CONTRIBUTING.md#step-6-sign-the-cla)
+
+**Thanks for contributing to the Selenium IDE!**
+**A PR well described will help maintainers to quickly review and merge it**
+
+Before submitting your PR, please check our [contributing](https://github.com/SeleniumHQ/selenium-ide/blob/master/CONTRIBUTING.md) guidelines.
+Avoid large PRs, help reviewers by making them as simple and short as possible.
+
+
+<!--- Provide a general summary of your changes in the Title above -->
+
+### Description
+<!--- Describe your changes in detail -->
+
+### Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+
+### Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+### Checklist
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] I have read the [contributing](https://github.com/SeleniumHQ/selenium-ide/blob/master/CONTRIBUTING.md) document.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.
+<!--- Provide a general summary of your changes in the Title above -->