digital-platform#305 Include pull request template

.github/pull_request_template.md

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+**Author checklist**
+
+- [ ] Include primary ticket number in title - e.g. "#123 New styling for widget" - and any additional tickets in description
+- [ ] Fill in the details below and delete as appropriate
+- [ ] Be proactive in getting your work approved 💪
+
+---
+
+## What's included?
+Describe the changes included in this pull request and highlight dependencies with other repos/tickets
+
+## Who should test?
+✅ Product owner
+✅ Developers
+✅ UTG
+
+## How to test?
+Describe the steps required to test & verify this change
+
+## Risk - how likely is this to impact other areas?
+🟢 No risk - this is a self-contained piece of work
+🟠 Medium risk - this does change code that is shared with other areas
+🔴 High risk - this includes a lot of changes to shared code
+
+## Additional context
+Include screen grabs, notes etc.