docs: pull request template

.github/pull_request_template.md

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+### Description
+
+<!-- Describe the purpose of this PR, what's being adding and/or fixed -->
+
+-----
+
+### Notes to the reviewers
+
+<!-- In this section you can include notes directed to the reviewers, like explaining why some parts
+of the PR were done in a specific way -->
+
+-----
+
+### Suggested [CHANGELOG](https://github.com/cashubtc/cdk/blob/main/CHANGELOG.md) Updates
+
+<!-- Please do not edit the actual changelog but note what you changed here. -->
+
+#### CHANGED
+
+#### ADDED
+
+#### REMOVED
+
+#### FIXED
+
+----
+
+### Checklist
+
+* [ ] I followed the [code style guidelines](https://github.com/cashubtc/cdk/blob/main/CODE_STYLE.md)
+* [ ] I ran `just final-check` before committing