Create a simple PR template

Preparing for Hacktoberfest.

.github/PULL_REQUEST_TEMPLATE.md

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+Please include a summary of the change and which issue number is fixed, including relevant motivation and context. Feel free to mark this as a Draft or WIP and write up some details later.
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+# Description
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+Fixes # (issue)
+
+---
+
+Some things you might want to mention:
+
+1. Why are you making the change?
+2. Explain how it works and decisions you made.
+3. If you're fixing something, what was wrong? How should we stop from having this issue happen again?
+4. If this is a new feature or addition to functionality, why should it be added? What are the use cases? Who was asking for this functionality?
+
+If this is an unsolicited change or have no issue associated please do your best to detail the motivations behind this PR.