Create pull_request_template.md (#1110)

.github/pull_request_template.md

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+<!--
+
+Thank you for contributing to the watchtower project! 🙏
+
+We truly appreciate all the contributions we get from the community.
+
+To make your PR experience as smooth as possible, make sure that you
+include the following in your PR:
+
+- What your PR contributes
+- Which issues it solves (preferrably using auto closing instructions like "closes #123".
+- Tests that verify the code your contributing
+- Updates to the documentation
+
+Thank you again! ✨
+
+-->