chore: Add a PR template

Signed-off-by: Andrew Kofink <ajkofink@gmail.com>

.github/pull_request_template.md

@@ -0,0 +1,23 @@
+### Metadata
+
+Links to relevant docs, related PRs or issues, etc.
+
+### Problem / Motivation
+
+Describe what the problem is or why the change is needed
+
+### Solution
+
+- [ ] CHANGELOG entry is added for code changes
+
+Describe how you are solving the problem
+
+### Testing
+
+Describe any interesting automated test changes
+
+Provide a test project yaml file, if relevant
+
+Provide any additional reproducing steps
+
+Show expected output / screenshot