add pull_request_template.md

.github/pull_request_template.md

@@ -0,0 +1,42 @@
+<!-- Thank you for contributing to shazam!
+
+PR Title Format:
+1. pkg [, pkg2, pkg3]: what's changed
+2. *: what's changed
+
+-->
+
+### What problem does this PR solve?
+
+Issue Number: #xxx <!-- REMOVE this line if no issue to close -->
+
+Problem Summary:
+
+### What is changed and how it works?
+
+What's Changed:
+
+How it Works:
+
+### Related changes
+
+- PR to update `docs`:
+- Need to cherry-pick to the release branch
+
+### Check List <!--REMOVE the items that are not applicable-->
+
+Tests <!-- At least one of them must be included. -->
+
+- Unit test
+- Integration test
+- Manual test (add detailed scripts or steps below)
+- No code
+
+Side effects
+
+- Performance regression
+    - Consumes more CPU
+    - Consumes more MEM
+- Breaking backward compatibility
+
+### Release note <!-- bugfixes or new feature need a release note -->