Add build files

[K0IN]

Add build files (Docker), as stated in https://github.com/kevmo314/scuda/issues/31, i would like to use earthly to build binaries (docker does not seem to be the correct tool to do this).

We can also discuss switching, to make / cmake for a standardized build system (so people can hack more easily).

i also added a Dockerfile.client so people can use it as a base image for projects (switching out their base image with cuda client)

Lets also talk about:

• Automatic builds (on push)
• Providing prebuilds binaries / Docker images