Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+[TODO: describe, in-detail, what issue this PR addresses and how it addresses it. Link to relevant Github Issues.]
+
+# Testing procedure
+
+[TODO: describe, in-detail, how you tested this. The procedure must be detailed enough for the reviewer(s) to recreate it.]
+
+# Before opening a pull request
+- [ ] Format your code using [black formatter](https://black.readthedocs.io/en/stable/) `python3 -m black .`
+- [ ] Run your code through [pylint](https://pylint.readthedocs.io/en/latest/) and address (most) warnings/errors: `pylint --recursive=y .`
+
+# Before Merging
+- [ ] `Squash & Merge`