Create PULL_REQUEST_TEMPLATE.md

Author: Telroshan

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+*Please describe what changes you made, and why you feel they are necessary. Make sure to include
+code examples, where applicable.*
+
+Htmx version:
+Used extension(s) version(s):
+
+Corresponding issue:
+
+## Testing
+*Please explain how you tested this change manually, and, if applicable, what new tests you added.*
+
+## Checklist
+
+* [ ] I have read the [contribution guidelines](/CONTRIBUTING.md)
+* [ ] I ran the test suite locally (`npm run test`) and verified that it succeeded