test: the test now has a friendly comment

Server/src/test/java/uulm/teamname/marvelous/server/MarvelousServerTest.java

@@ -62,7 +62,11 @@ class MarvelousServerTest extends BaseGameLogicTest {
     }
 
 
+    // If you want to complete this test, go ahead. It's slightly complicated, but if you understand this test,
+    // you should also understand the server, which serves as a good intro to it. You can - of course - also
+    // just ignore it.
     @Test
+    @Disabled("Work in progress complete server test")
     void main() {
         UserManager m = UserManager.getInstance();