Implemented the DELETE /users/{username}/collection/folders/{folder_id} endpoints for the Open API specification document in the library target.

Sources/DiscogsService/openapi.yaml

@@ -1209,6 +1209,40 @@ paths:
           $ref: '#/components/responses/NotFound'
         '500':
           $ref: '#/components/responses/InternalError'
+    delete:
+      tags:
+        - User Collection
+      summary: Delete a collection folder from a collection of a user.
+      description: |
+        Deletes a collection folder from a collection of a user. 
+        
+        > important: A folder must be empty before it can be deleted.
+
+        This endpoints requires authentication as the collection owner.
+      operationId: deleteUserCollectionFolder
+      parameters:
+        - $ref: '#/components/parameters/Username'
+        - $ref: '#/components/parameters/FolderId'
+      security:
+        - ConsumerKeySecret: []
+        - UserToken: []
+        - OAuth: []
+      responses:
+        '204':
+          description: Successfully delete a specific collection folder of a user.
+          headers:
+            X-Discogs-RateLimit:
+              $ref: '#/components/headers/RateLimit'
+            X-Discogs-RateLimit-Used:
+              $ref: '#/components/headers/RateLimitUsed'
+            X-Discogs-RateLimit-Remaining:
+              $ref: '#/components/headers/RateLimitRemaining'
+        '403':
+          $ref: '#/components/responses/NotAccessable'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '500':
+          $ref: '#/components/responses/InternalError'
 components:
   headers:
     Link: