Docs: Feature item from RFC #48

.github/ISSUE_TEMPLATE/feature_requests_from_rfc.yml

@@ -0,0 +1,58 @@
+name: Feature from RFC
+description: Feature item from RFC
+labels: [enhancement]
+
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: RFC feature description
+      description: A clear and concise description of the specific feature mentioned in the RFC.
+      placeholder: Ex. Nested Properties is a feature in CSS that groups related properties to improve code readability and reduce redundancy
+    validations:
+      required: true
+
+  - type: input
+    id: related-rfc
+    attributes:
+      label: Related RFC
+      description: Related RFC in the [working group](https://github.com/mincho-js/working-group).
+      placeholder: Paste the RFC link
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: The solution I'd like
+      description: A clear and concise description of what you want to happen.
+      placeholder: Tell us what you want!
+    validations:
+      required: false
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots or video
+      description: It is helpful to attach screenshots or video similar to the desired features.
+      placeholder: You can drag & drop to attach files
+    validations:
+      required: false
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives I've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+      placeholder: It would be great if you have a relevant image or link
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+      placeholder: Anything to write down or refer to is fine
+    validations:
+      required: false