Add PR template (immich-app#2192)

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Description
+<!--- Describe your changes in detail -->
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+Fixes # (issue)
+
+
+## How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
+
+- [ ] Test A
+- [ ] Test B
+
+## Screenshots (if appropriate):
+
+
+## Checklist:
+
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation