add mtc popsim example

[bstabler]

Consistent with the ActivitySim example, I think it makes sense to add the MTC TM1 PopSim setup as an additional example to this repo. @lmz?

[bstabler]

@lmz gave the ok to add a TM1 example for populationsim to go along with the TM1 activitysim ABM example. The data and example setup is at:

https://github.com/BayAreaMetro/populationsim/tree/master/bay_area/hh_gq

[bettinardi]

Low level lift to add a good partner example to the documentation. Phase 9 effort