Add documentation about using Crick with Watson

[jmaupetit]

Purpose

We recently open-sourced Crick and there is only sparse documentation about how Watson & Crick talk to each other. Let's clarify this!

Proposal

We should work on:

• [ ] Add basic documentation in the README.md
• [ ] Improve the sync command documentation
• [ ] Improve the backend section of docs/user-guide/configuration.md
• [ ] Improve the overview section of docs/index.md

[3ynm]

Yup! this is needed. I want to export watson data for creating my own view (not crick) and probably the sync command would help a lot, but I don't know how it works :(

Also, please try to not bloat the code of watson because of coupling other tools, "high-cohesion, low-coupling". Thanks for this SW :)

[3ynm]

Apparently crick is a dead project? Still we could use this functionality to extract data, plz let us know how

[jmaupetit]

Basically, the sync command performs a pull and then a push to a crick server. I invite you to read the code in the meantime:

• sync: https://github.com/TailorDev/Watson/blob/master/watson/cli.py#L1462
• pull: https://github.com/TailorDev/Watson/blob/master/watson/watson.py#L379
• push: https://github.com/TailorDev/Watson/blob/master/watson/watson.py#L409