add PR MD (#4)

.github/pull_request_template.md

+### What problem does this PR solve?
+
+Add corresponding issue link with summary if exists -->
+
+Issue link:
+
+### What is changed and how it works?
+
+### Code changes
+
+- [ ] Has Code change
+- [ ] Has CI related scripts change
+
+### Check List
+
+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
+- [ ] Performance regression: Consumes more Memory
+- [ ] Breaking backward compatibility
+
+### Note for reviewer