Rewrite ./elchemy bash file in Elixir Script

[wende]

Card created from idea in #287

[wende]

@baransu do you reckon you can continue working on that task?
If so can I assign you to it for now?
Let me know if in doubt about any of the tools used for this

[baransu]

I’ll try to create WIP PR as fast as it will be usabe to gain feedback :)

[wende]

Any progress? @baransu

[baransu]

There is elchemy-cli-in-elixir branch. It's basically just setup. Unfortunately I won't have time in the near future so feel free to continue.