[ci skip] add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## BACKEND-STORY_ID One-sentence summary of changes
+
+#### Is it a breaking change?: NO / YES
+
+### Why did you make these changes?
+
+Service `X` requires `Y` field from response entity of `Z` API call.
+
+### What's changed in these changes?
+
+I added `X` field to `Y` entity.
+
+### What do you especially want to get reviewed?
+
+The method of rendering `X` field
+
+### Is there any other comments that every teammate should know?
+
+You should use `X` field instead of using `Y` field
+
+
+### Submission Type
+
+* [ ] Bugfix
+* [ ] New Feature
+* [ ] Refactor
+
+### All Submissions
+
+* [ ] Have you added an explanation of what your changes?
+* [ ] Have you written new tests for your changes, as applicable?
+* [ ] Have you checked potential side effects that could make bad impacts to other services?
+
+
+### New Features
+
+* [ ] Have you configured CI/CD properly?
+* [ ] Have you configured optimal memory size and timeouts of Lambda Function?
+* [ ] Have you grant required permissions (e.g. IAM Policy, VPC Security Group)?
+* [ ] Have you made required resources (e.g. DynamoDB Table, RDS Cluster)?
+* [ ] Does it requires native addons dependency?