Create pull_request_template.md (#435)

Author: patrick-tolosa

.github/pull_request_template.md

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+### Brief Summary of Changes
+<!--
+Provide some context as to what was changed, from an implementation standpoint.
+-->
+
+#### What does this PR address?
+[ ] Gitub issue (Add reference - #XX)
+[ ] Refactoring
+[ ] New feature
+[ ] Bug fix
+[ ] Adds more tests
+
+#### Are tests included?
+[ ] Yes
+[ ] No
+
+#### Reviewer, Please Note:
+<!--
+List anything here that the reviewer should pay special attention to. This might
+include, for example:
+• Dependence on other PRs
+• Reference to other Cloudinary SDKs
+• Changes that seem arbitrary without further explanations
+-->