Simple RCON client to send commands to Rust game server

1. Rename .env.example into .env and fill it with your data
2. Build the app with cargo build --release and find the client in the ./target/release directory
3. Run any command on the running Rust server where you have RCON access: ./rcon-client -c "say 'Hello'" -e "/path/to/.env"

Param -e is optional and in case it omitted, the app will try to find .env in same dir