feat: add feature-request.md (#92)

.github/ISSUE_TEMPLATE/feature_request.md

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+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.)