Be explicit on the python dependencies

[lu-zero]

No description provided.

[glguy]

Would it make sense to create a requirements.txt to help automate this?

https://pip.pypa.io/en/stable/user_guide/#requirements-files

[lu-zero]

I guess all depends on how you'd consider eventually distributing the whole package.
Right now it has plenty of moving parts and I guess we are far from a final state.

A requirements.txt and mention of it in the README.md would be surely good for newcomers like me :)

[thedataking]

@glguy yes, I added a requirements.txt file and updated the build scripts to use it on the internal branch. I'll update the README to mention it.

[thedataking]

Closing issue. README.md has been updated to explain how to (mostly) automatically provision a build environment. Thanks for the suggestion @lu-zero!