chore: add PR template

Author: thymikee

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+<!-- Please provide enough information so that others can review your pull request. -->
+<!-- Keep pull requests small and focused on a single change. -->
+
+### Summary
+
+<!-- What existing problem does the pull request solve? Can you solve the issue with a different approach? -->
+
+### Test plan
+
+<!-- List the steps with which we can test this change. Provide screenshots if this changes anything visual. -->