Architechtural Diagram for Taarifa API

[markiliffe]

Have an architectural diagram for the TaarifaAPI that exists in the wiki so that new contributors to the project can understand how the system architecture works.

[kynan]

I have added an architecture diagram to the wiki.

[dgorissen]

This was actually a task for the dar team! :)

[kynan]

This is the diagram from Google Drive I had created a while ago. Could do with an update.