Github: Add PR Template

.github/PULL_REQUEST_TEMPLATE.md

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+> [!TIP]
+> **About PR Titles**  
+> The titles of all PRs will appear together on the "What's New" page, so a clear, concise explanation is important.
+> 
+> PR titles should include page title(s), start with action verbs (e.g., Fixed, Added, Improved, Updated), and describe what was updated.
+>     
+> For example:
+> - Checkbox: Added Storybook examples
+> - Experimental Components and Patterns: Improved guidance
+> - Links: Fixed typos
+> - Multiple Responses: Updated usage guidance
+
+## Summary
+_Provide a brief summary of what this PR does, if the title doesn't fully capture it._
+
+## Related issue
+_If this PR resolves an open issue, please add the issue number here._
+
+Closes #[Issue_number]
+
+## Preview link
+
+> [!TIP]  
+> A preview environment is automatically created and updated with every PR (including draft PRs).
+>
+> Once you've committed, we run some automated checks and generate this preview environment, so it takes a minute or two.
+>
+> The URL of this preview environment follows this format:
+>
+> `https://dev-design.va.gov/[This_PR_number]`
+>
+> Eventually you will see an entry in the timeline similar to this:
+>   
+>  > [Your Username] deployed to development [X time] ago - with Github Actions [View Deployment]
+> 
+> Clicking the "View Deployment" button will open a browser window to preview your changes as they will appear after being merged.
+>   
+> **Note:** The preview environment only works for PRs submitted to the official repository. It will not work for forked repositories.
+
+[Open Preview Environment](https://dev-design.va.gov/[This_PR_number])  ⬅️ Update with your PR preview URL