Provide install script/package for Linux based systems

Since lima runs perfectly on Linux machines and also have binaries for Linux based systems,
I think we should include a shell script for install them, instead of the manual install which is hidden in the README by default.

Or alternatively we can provide/build deb/rpm etc packages. (But I think this is overkill and harder to maintain right now.)

I am more then happy to create a PR if we can talk about the details.