Rename implementation request file extension and remove field description

This commit renames the issue template file from .yaml to .yml, to ensure consistency with existing files. It also removes the empty 'description' field from the 'plugin_api_url' entry, thereby simplifying the template configuration.

.github/ISSUE_TEMPLATE/implementation-request.yml

@@ -0,0 +1,27 @@
+name: "Implementation request"
+description: "Suggest a plugin that needs implementation for YardWatchAPI"
+title: "[NEW IMPLEMENTATION]: "
+labels: ["enhancement"]
+body:
+  - type: "input"
+    id: "plugin_name"
+    attributes:
+      label: "Plugin name"
+      placeholder: "Name of the plugin you want to implement YardWatchAPI"
+    validations:
+      required: true
+  - type: "input"
+    id: "plugin_api_url"
+    attributes:
+      label: "Link to plugin's developer API"
+      placeholder: "Link to plugin's developer API"
+    validations:
+      required: false
+  - type: "checkboxes"
+    id: "dev_contacted"
+    attributes:
+      label: "Contact the developer(s) of the plugin you're requesting here first."
+      options:
+        - label: "I informed the developer that they can implement YardWatchAPI directly in their plugin per
+                 instructions at [YardWatchAPI readme page](https://github.com/YouHaveTrouble/YardWatchAPI/blob/master/readme.md)"
+          required: true