Create feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "💡 Feature request"
+about: Submit your idea for a change in the codebase.
+---
+
+# Feature request
+
+<!--
+This issue should serve for you to present or pitch an idea to the maintainers - but remember that it would be better if you were to submit a PR instead 🤗
+-->
+
+## Why it is needed
+
+<!--
+Please tell us a bit more of why you want this feature to be added, what's its origin.
+-->
+
+## Possible implementation
+
+<!--
+It really helps if you could describe from a technical POV how this new feature would work, which code it rely on, etc.
+-->
+
+### Code sample
+
+<!--
+Please show how the new code could work, if doable.
+-->