chore(repo): add PR template (#56)

* chore(repo): add PR template

* chore: add CODEOWNERS

.github/CODEOWNERS

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+/*                     @EvanBacon

.github/PULL_REQUEST_TEMPLATE

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+<!--
+🚨 We use semantic release (a bot publishes everything automatically)
+🚨 so please use conventional commit style for the PR title:
+🚨 https://www.conventionalcommits.org/en/v1.0.0/
+🚨 Example: feat(detox): add new step
+-->
+
+# Why
+
+<!--
+Please describe the motivation for this PR, and link to relevant GitHub issues, forums posts, or feature requests.
+-->
+
+# How
+
+<!--
+How did you build this feature or fix this bug and why?
+-->
+
+# Test Plan
+
+<!--
+Please describe how you tested this change and how a reviewer could reproduce your test, especially if this PR does not include automated tests! If possible, please also provide terminal output and/or screenshots demonstrating your test/reproduction.
+-->