PR: add pull request template

.gitea/workflows/PULL_REQUEST_TEMPLATE.md

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+## Description of the change
+
+<!-- Brief summary of the change if not already clear from the title -->
+
+## Checklist
+
+- [ ] Updated Documentation
+- [ ] Added tests
+- [ ] Doesn't affect backwards compatibility - or check the next points
+  - [ ] Add the breaking change and migration details to docs/release-notes.md
+  - !!! Review from another person is required *BEFORE* merge !!!
+- [ ] Add introduction of major feature to docs/release-notes.md

docs/release-notes.md

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+# clan-core release notes 25.11
+
+<!-- This is not rendered yet -->
+
+## New features
+
+## Breaking Changes
+
+## Misc