Create initial implementation for solution check

src/app/app.py

@@ -20,8 +20,8 @@ def zmq_callback(stream, msg_parts):
         stream.send_multipart(serialize_all(key, 'OK'))
     if key == 'solution_check':
         stream.send_multipart(serialize_all(key, {
-            'solved': True,
-            'message': 'solved'
+            'solved': fsm.is_solved(),
+            'message': 'solved' if fsm.is_solved() else 'not solved'
         }))