docs: guidance for UX related PRs #4950

Author: ivikash

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,7 +9,7 @@
     - Update the changelog using `npm run newChange`.
     - Link to related issues/commits.
     - Testing: how did you test your changes?
-    - Screenshots
+    - Screenshots (if the pull request is related to UI/UX then please include light and dark theme screenshots)
 -->
 
 ## License