improve readme with network examples

[renanxcortes]

I'm +1 for improving the ReadMe to encourage users to use the package. I think that the network graphs of Atlanta would be a nice visualization to add in the ReadMe right after the inference example. Aso an explanation of the networks based segregation in the readme would be cool (or perhaps only mentioning the notebook, but I think a summary would be suitable).

[knaaptime]

agreed, it could use an overhaul now that we have so much more structure in place