Feature: PR templates (#19)

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Use this template as a guide to describe your pull request, and adjust as necessary. -->
+<!-- Include information that helps your peers review your updates and understand this    -->
+<!-- repository's history of changes over time.                                           -->
+
+<!-- Delete any options that are not relevant -->
+
+- [ ] Tests for the changes have been added
+- [ ] Related documentation has been added / updated
+
+### 📝 Description
+
+<!-- Contributions are welcome! If there is a corresponding      -->
+<!-- Ticket, link to it by replacing `#` with ticket number -->
+
+🔗 [Ticket #]()
+
+<!-- Replace this with a high-level description of the features/functionality proposed in the pull request. -->
+
+Changes include:
+
+- [Thing]
+- [Other thing]
+- [More things]
+
+### 📸 Screenshots
+
+<!--
+If your work here contains visual changes, provide before (optional) and after screenshots, GIFs, or videos.
+
+If not, then delete this section
+-->
+
+| Before (Optional)                      | After                                 |
+| -------------------------------------- | ------------------------------------- |
+| <!-- Paste before image/video here --> | <!-- Paste after image/video here --> |
+
+### 🪤 Peer Testing
+
+<!-- If peer testing is not needed, then delete this section -->
+<!-- Uncomment out any of the following as needed:           -->
+<!-- **Requires `yarn install`**     -->
+
+<!--
+Replace this with a series of test steps & expected outcomes.
+
+Example test step:
+
+- This is a test step.  Highlight actions **in bold**.
+
+    **Expected outcome:** This is what to expect after the step
+-->
+
+### ✏️ Notes
+
+<!--
+Replace this line with anything else you think may be relevant or related PRs
+
+If there are no notes, then delete this section.
+-->