feat: add support for username, IP, and port configuration via launch arguments

README.md

@@ -33,10 +33,22 @@ Basic LAN multiplayer is available on the Windows build
 - Other players on the same LAN can discover the session from the in-game Join Game menu
 - Game connections use TCP port `25565` by default
 - LAN discovery uses UDP port `25566`
-- You can override your in-game username at launch with `username.txt`
 
 This feature is based on [LCEMP](https://github.com/LCEMP/LCEMP/)
 
+### Launch Arguments
+
+| Argument           | Description                                                                                                    |
+|--------------------|----------------------------------------------------------------------------------------------------------------|
+| `-name <username>` | Sets your in-game username                                                                                     |
+| `-ip <address>`    | Manually connect to an IP if LAN advertising does not work or if the server cannot be discovered automatically |
+| `-port <port>`     | Override the default port if it was changed in the source                                                      |
+
+Example:
+```
+Minecraft.Client.exe -name Steve -ip 192.168.0.25 -port 25565
+```
+
 ## Controls (Keyboard & Mouse)
 
 - **Movement**: `W` `A` `S` `D`