For setup instructions please see the fabric wiki page that relates to the IDE that you are using.
This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.
frank-cywong/liveoverflow-client-mod
My first Minecraft mod, a client mod that would filter the packets and bypass the movement checks needed to play on the LiveOverflow Minecraft server.
JavaCC0-1.0