Create PULL_REQUEST_TEMPLATE.md

Author: rock3r

.github/PULL_REQUEST_TEMPLATE.md

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+_What is the aim of this PR?_
+
+## Implemented solution
+
+_How does this PR achieve said goal? Explain at a high level the implementation._
+
+## REQUIRED: pre-PR checklist
+
+* [ ] The project compiles/runs
+* [ ] The implemented solution works as intended
+* [ ] Dry-run (`-d`) doesn't actually perform any action besides logging
+* [ ] The `README.md` file has been updated