Add ability for running in terminal (cli)

[kupriyanenko]

[prantlf]

I was in need of such tool, both runnable from a shell and programmatically from a Node.js script. I published astrobench-cli using my fork of your project. I opened a couple of PRs with changes that I made to get the cli working, especially #10.

[kupriyanenko]

Great, will deep dive a bit later.