Command line switches are as follows:
Usage: citra.exe [options] <filename>
-g, --gdbport=NUMBER Enable gdb stub on port NUMBER
-i, --install=FILE Installs a specified CIA file
-m, --multiplayer=nick:password@address:port Nickname, password, address and port for multiplayer
-r, --movie-record=[file] Record a movie (game inputs) to the given file
-p, --movie-play=[file] Playback the movie (game inputs) from the given file
-d, --dump-video=[file] Dumps audio and video to the given video file
-f, --fullscreen Start in fullscreen mode
-h, --help Display this help and exit
-v, --version Output version information and exit