docs: add template for GitHub PR

.github/PULL_REQUEST_TEMPLATE.md

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+## Context
+
+<!-- PR Context:
+A quick overview of the "why" of this PR to help reviewers
+If applicable, provide links to GitHub tickets
+-->
+[GitHub Ticket](https://github.com/jondeaves/venom/issues/XXX)
+
+## Description
+
+<!-- Description of PR:
+List of bullet points and screenshots are appreciated
+If applicable, have you thought of updating existing docs or
+create a new one?
+-->
+
+## Dependencies
+
+<!-- Optional: what prior work is required before merging?
+Link to PRs or describe manual steps
+-->
+
+## Testing
+
+<!-- What steps have been taken to test this work? -->
+
+- [ ] Manual / unit testing