Create pull_request_template.md

Author: tianchu

.github/pull_request_template.md

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+<!--- Please remember to review the [contribution guidelines](https://github.com/DataDog/datadog-lambda-layer-python/blob/master/CONTRIBUTING.md) if you have not yet done so._  --->
+
+### What does this PR do?
+
+<!--- A brief description of the change being made with this pull request. --->
+
+### Motivation
+
+<!--- What inspired you to submit this pull request? --->
+
+### Testing Guidelines
+
+<!--- How did you test this pull request? --->
+
+### Additional Notes
+
+<!--- Anything else we should know when reviewing? --->
+
+### Types of changes
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Misc (docs, refactoring, dependency upgrade, etc.)
+
+### Checklist
+
+- [ ] This PR's description is comprehensive
+- [ ] This PR contains breaking changes that are documented in the description
+- [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
+- [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
+- [ ] This PR's changes are covered by the automated tests
+- [ ] This PR collects user input/sensitive content into Datadog