Add back pr template

.github/pull_request_template.md

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+## Description
+
+<!-- What changed? Why? (the code + comments should speak for itself on the "how") -->
+
+<!-- Fun screenshots or a cool video or something are super helpful as well. If this touches platform-specific behavior, this is where test evidence should be collected. -->
+
+<!-- Any issues this pull request closes or pull requests this supersedes should be linked with `Closes #issuenumber`. -->
+
+## Meta
+
+Merge checklist:
+- [ ] Pull Request title is [short, imperative summary](https://cbea.ms/git-commit/) of proposed changes
+- [ ] The description documents the _what_ and _why_
+- [ ] If this PR changes behavior or adds a feature, user documentation is updated
+- [ ] If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
+- [ ] If this PR touches configuration, this is backwards compatible with settings back to v2024.3.1
+- [ ] If this PR addresses a bug, a regression test for it is added