Create USEFUL_TIPS.md

Author: valkyrienyanko

.github/USEFUL_TIPS.md

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+# Useful Tips
+
+## Logging packet opcodes
+If you don't see the opcodes, these lines of code might be commented out. Feel free to un-comment them. As of writing this I noticed there is a [Client] prefix for the client but no [Server] prefix for the server.
+
+### Server packets
+https://github.com/GodotModules/GodotModulesCSharp/blob/4e1f6b20c99256a5ac2164b463412f64d87f942d/Scripts/Netcode/Server/GameServer.cs#L101-L103
+
+### Client Packets
+https://github.com/GodotModules/GodotModulesCSharp/blob/4e1f6b20c99256a5ac2164b463412f64d87f942d/Scripts/Msc/GodotCommands.cs#L25-L30