Update and rename extension-request.md to extension-request.yml

.github/ISSUE_TEMPLATE/extension-request.yml

@@ -0,0 +1,27 @@
+name: Extension request
+description: Request an existing Flarum extension.
+labels: ["🙋 Extension/feature request"]
+assignees:
+  - CWKevo
+body:
+  - type: input
+    id: extension_url
+    attributes:
+      label: Extension URL
+      description: Enter an URL to the extension
+      placeholder: https://packagist.com/packages/...
+    validations:
+      required: true
+  - type: textarea
+    id: why
+    attributes:
+      label: Why should we install this extension?
+      description: Give us a brief explanation why should this extension be added to FreeFlarum
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        ---
+        > ###### **Note**: All new extension requests require at least 5 upvotes (👍) before they can be added to FreeFlarum. If you are interested in this extension, please upvote this issue by adding the "👍" reaction to this comment. [Why?](https://discuss.flarum.org/d/7585/3828#:~:text=as%20a%20result%20of%20this%2C%20all%20extension%20requests%20must%20now%20provide%20a%20valid%20reason%20why%20should%20that%20extension%20be%20installed%2C%20and%20must%20have%20at%20least%205%20upvotes.%20Not%20following%20the%20template%20might%20result%20in%20your%20request%20being%20denied.)
+        ---