GPII-2021: Add NexusConnector documentation

[simonbates]

No description provided.

[gpii-bot]

CI job passed.

[amb26]

I'm happy that these docs look in general reasonable but I can't assess their correctness - I remember at an arch meeting some months ago we considered that someone else might review them, but I can't remember who - @simonbates ?

[simonbates]

I wonder if @waharnum might be a good person as he has some familiarity with the Nexus and AsTeRICS?

[waharnum]

@simonbates @amb26 I'm happy to review the docs and provide feedback - tomorrow perhaps? (away today)

[waharnum]

Is it worth mentioning that more concrete examples of Nexus/AsTeRICS integration can be found in the repo at https://github.com/simonbates/nexus-demos?

[waharnum]

Another thing it may be worth adding based on the conversation @simonbates & I just had:

• a section on the current state of the NexusConnector - what would someone interested in experimenting with it need to do? It sounds like the current requirements would be:
  • use the fork at https://github.com/simonbates/AsTeRICS/tree/GPII-1543
  • follow the build instructions at https://github.com/simonbates/AsTeRICS/tree/GPII-1543#quick-build-instructions-for-windows

The above can be updated when the NexusConnector is in the AsTeRICS project repo - @simonbates says this may happen soon, so is it perhaps worth waiting until that happens?