Add discord link to README

README.md

 # Grasscutter
 A WIP server emulator for Genshin Impact 2.3-2.6
 
+**Note**: For support please join the [Discord server](https://discord.gg/T5vZU6UyeG).
+
 # Current features
 * Logging in
 * Spawning monsters via console
@@ -55,4 +57,4 @@ There is a dummy user named "Server" in every player's friends list that you can
 ### Troubleshooting
 * If compiling wasnt successful, please check your JDK installation (must be JDK 8 and JDK's bin PATH variable is correct)
 * My client doesn't connect, doesn't login, 4206, etc... - Mostly your fiddler is the issue, make sure it running on another port except 8888
-* Startup sequence: Mongodb > The server > Fiddler > Client
\ No newline at end of file
+* Startup sequence: Mongodb > The server > Fiddler > Client