Add DockerFile

[banyan-god]

This Dockerfile sets up environment to start the training process. You still need to download and run python dev/data/fineweb.py --version 10B

You can build the dockerfile using

docker build -t llmc .

and run it using

docker run -it --ulimit memlock=-1:-1 --ulimit stack=67108864:67108864 --shm-size 2g --gpus all llmc bash