Make a PR description template.

.github/pull_request_template.md

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+### Description
+
+A clear and concise description of what the change is.
+
+### Related Issue(s)
+
+Please link to any related issues here.
+
+### Type of Change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+- [ ] Refactoring (no functional changes)
+- [ ] Build-related changes
+- [ ] Performance improvement
+
+### Testing
+
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.
+
+- [ ] Test A
+- [ ] Test B
+
+### Changelog Entry
+
+Please provide a one-line summary of your change for the changelog. This will be used in the release notes. For example:
+
+- **Added** a new endpoint for fetching user data.
+- **Fixed** a bug where the login button was not responsive.
+
+**Changelog Summary:**