Create pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Hey there. Thank you so much for improving Fossify. Please consider filling out the details :)-->
+
+#### What is it?
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Codebase improvement
+
+#### Description of the changes in your PR
+<!-- Bullet points are preferred. The following is an example -->
+- Updated colors
+- Update strings
+- Added documentation
+
+#### Before/After Screenshots/Screen Record
+<!-- If your PR changes the app's UI in any way, consider including screenshots or a video showing exactly what changed, so that developers and users can pinpoint it easily. Delete this if it doesn't apply to your PR.-->
+- Before:
+- After:
+
+#### Fixes the following issue(s)
+<!-- Prefix issues with "Fixes" so that GitHub closes them when the PR is merged (note that each "Fixes #" should be in its own item). Also add any other relevant links. -->
+- Fixes #
+
+#### Relies on the following changes
+<!-- Delete this if it doesn't apply to your PR. -->
+- 
+
+#### Acknowledgement
+- [ ] I read the [contribution guidelines](https://github.com/FossifyOrg/Calendar/CONTRIBUTING.md).