Add a Pull Request template

Author: onethumb

.github/PULL_REQUEST_TEMPLATE.md

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+## The Problem
+
+[ What are you trying to solve? Why are you trying to solve it? ]
+
+## The Solution
+
+[ How are you fixing the problem? High-level explanation. ]
+
+### Changes
+
+[ A more detailed explanation of the solution to guide reviewers. Point out tricky or magic areas. ]
+
+### Planned version bump
+
+- Which: [ `MAJOR`, `MINOR`, `PATCH` ]
+- Why: [ non-breaking bug fix, doc change, test coverage, formatting, debugging, profiling, security fix, internal change, experimental change, non-breaking new functionality, breaking change, etc ]
+
+### Links
+
+* [ Any important other PRs, Issues, PRs, etc? ]
+
+## Notes
+
+[ @mentions for anyone who should be alerted to this PR ]
+
+[ **Please assign reviewers if you want someone specific to review this** ]
+
+[ **Please do not forget to add labels specific to this PR** ]