Update FEATURE_REQUEST.md

I obtained this Feature_Request from here: wagtail/wagtail#5560.

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

@@ -1,4 +1,35 @@
+Request a new feature!
 ---
-name: Feature Request
-about: Request a new feature!
----
+### Is your proposal related to a problem?
+
+<!--
+  Provide a clear and concise description of what the problem is.
+  For example, "I'm always frustrated when..."
+-->
+
+(Write your answer here.)
+
+### Describe the solution you'd like
+
+<!--
+  Provide a clear and concise description of what you want to happen.
+-->
+
+(Describe your proposed solution here.)
+
+### Describe alternatives you've considered
+
+<!--
+  Let us know about other solutions you've tried or researched.
+-->
+
+(Write your answer here.)
+
+### Additional context
+
+<!--
+  Is there anything else you can add about the proposal?
+  You might want to link to related issues here, if you haven't already.
+-->
+
+(Write your answer here.)