stub PR Template for fellows

Addresses #59

Feel free to line edit right on this PR

.github/pull_request_template.md

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+# Learners, PR Template
+
+## Self checklist
+
+- [ ] I have titled my PR with `For Mentor Review | {Project Name} | {My Name}`
+- [ ] I have included a list of changes
+- [ ] I have tested my changes
+- [ ] I have explained my changes
+- [ ] I have asked someone to review my changes
+
+## Description
+
+### Change list
+
+- List changes
+- This might relate to specific commits in your PR but just pull out the key lines
+
+## Rationale, briefly
+
+- What is the goal of these changes?
+- How did these changes address this goal or goals?
+- Why are they a good idea?
+
+## @mentions, #links
+
+- Who needs to know about this? @mention them
+- Is this related to another issue, PR, or repo? #link them