Feature request template.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new idea for Map.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for using Map!
+        If you are looking for support, please check out our documentation
+        or consider asking a question.
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for this feature request or proposal.
+      options:
+        - label: I have searched the [existing issues](https://github.com/xclud/flutter_map/issues)
+          required: true
+  - type: textarea
+    attributes:
+      label: Use case
+      description: |
+        Please tell us the problem you are running into that led to you wanting
+        a new feature.
+        Is your feature request related to a problem? Please give a clear and
+        concise description of what the problem is.
+        Describe the alternative solutions you've considered. Is there a package
+        on pub.dev that already solves this?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Proposal
+      description: |
+        Briefly but precisely describe what you would like Map to be able to do.
+        Consider attaching something showing what you are imagining:
+         * images
+         * videos
+         * code samples
+        Does this have to be provided by Map directly, or can it be provided
+        by a package on pub.dev? If so, maybe consider implementing and
+        publishing such a package rather than filing an issue.
+    validations:
+      required: true