new(contrib): create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+⚡️ katchow! We ❤️ Pull Requests! If you remove or skip this template, you'll
+make the 🐼 sad and the mighty god of Github will appear and pile-drive the
+close button from a great height while making animal noises.
+
+Pull Request Requirements:
+
+- Please include tests to illustrate the problem this PR resolves.
+- Please lint your changes by running `npm run lint` before creating a PR.
+- Please update the documentation in `/docs` where necessary Please place an x
+  (no spaces - [x]) in all [ ] that apply.
+-->
+
+# What Does This PR Do?
+
+This PR contains:
+
+- [ ] bugfix
+- [ ] feature
+- [ ] refactor
+- [ ] documentation
+- [ ] other
+
+Are tests included?
+
+<!--
+If your PR fixes a bug (🐜/🐛/🐞), the existing tests are 100% sure not to cover
+the expected behavior. Update them, or add new ones. 🧪✅
+-->
+
+- [ ] yes (_bugfixes and features will not be merged without tests_)
+- [ ] no
+
+Breaking Changes?
+
+- [ ] yes (_breaking changes will not be merged unless absolutely necessary_)
+- [ ] no
+
+If yes, then include "BREAKING CHANGES:" in the first commit message body,
+followed by a description of what is breaking.
+
+List any relevant issue numbers:
+
+## Description
+
+<!--
+Please be thorough and clearly explain the problem being solved.
+
+- If this PR adds a feature, look for previous discussion on the feature by
+  searching the issues first.
+- Is this PR related to an issue?
+-->