Add PR template for github

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+Include a few sentences describing the overall goals for this pull request.
+
+## Checklist
+
+All checklist items should be addressed before a QGIS maintainer will review the request:
+
+- [ ] I've read the [QGIS Coding Standards](https://www.qgis.org/en/site/getinvolved/development/qgisdevelopersguide/codingstandards.html) and this PR complies with them
+- [ ] This PR passes all existing unit tests
+- [ ] New unit tests have been added for core changes
+- [ ] I've run the scripts/prepare-commit.sh script before each commit
+- [ ] Commit messages are descriptive and explain the rationale for changes
+- [ ] Commits which fix bugs include "fixes #11111" in the commit message
+- [ ] Commits which add new features are tagged with \[FEATURE\] in the commit message
+- [ ] Commits which change the UI or existing user workflows are tagged with \[needs-docs\] in the commit message
+
+
+