Dockerfile to build image based on python:3.10.10-slim-bullseye

[argoneus]

Added Dockerfile for building a Docker image of picoGPT

[jaymody]

Thanks for the PR!

I'm going to leave this unmerged, want to keep the repo as minimal as possible (while the dockerfile is minimal, I'd need to document it in the README.md and also I'd need to add a .dockerignore).

[argoneus]

No worries!

[shantanuo]

Updating README is a small price to pay for a standard utility like Docker. Please consider merging because the people like me who do not notice this discussion, will write their own Dockerfile!