PR for: Docs: Installation instructions

[joeflack4]

Updates

Added installation instructions, including additional steps for `SqlImplementation`

Addresses: #233

[joeflack4]

Depends on: INCATools/relation-graph#146

[joeflack4]

Depends on: ontodev/rdftab.rs#22

[cmungall]

Thanks for the contribution! We can include the base installation instructions

For the sqlite part: Let's not duplicate this documentation everywhere

remember, you don't need relation-graph or even sqlite to use SqlImplementation.

the complicated install of relation-graph and rdftab is only required for compiling a sqlite from owl source.

99% of OAK users won't need this, they will be using a pre-generated sqlites e.g. via sqlite:obo:mondo, and for this an pure python install from PyPI is sufficient.

and even for the smaller group who need to do the compliation, the complicated steps will disappear soon: INCATools/semantic-sql#41

the appropriate place for the granular description is in this tutorial - can you give this a read over and make any PRs there?

https://incatools.github.io/ontology-access-kit/intro/tutorial07.html

[joeflack4]

@cmungall Thanks for looking this over.

Done on the new PR: #242

I must say, I don't enjoy .rst outside of the usefulness of toc tree.

Also, just made some edits to this PR to remove the SqlImplementation part of the installation, if you want to re-open and merge this one. I know it's pretty obvious, but I like to leave things simple for Jr devs who may not have Python experience.