Create backend endpoints
Create backend endpoints

* propose endpoints for getting and adding place in datastore added
* fix some formatting
* getting currently takes in User as proposed by Tyler, although I think string might be a slightly better way to do this because this is how get messages works?
* TODO: 
  * delete user class here while still having datastore work since same class is in Message.java (reduce redundancy)
  * separate endpoints in separate files while still working with datastore (clean)
google/step197-2020,google/step197-2020,google/step197-2020,google/step197-2020