added jumpDive game

src/main/java/eu/mhsl/minenet/minigames/command/Commands.java

@@ -41,7 +41,7 @@ public enum Commands {
     static {
         MinecraftServer.getCommandManager().setUnknownCommandCallback((sender, command) -> {
             if(command.isBlank()) return;
-            new ChatMessage(Icon.ERROR).appendStatic("Unknown command").quote(command).send(sender);
+            new ChatMessage(Icon.ERROR).appendStatic("Unknown command: ").quote(command).send(sender);
         });
     }
 }