Clearinghouse needs to be able to collect privacy setting from individual devices

[yyzhuang]

In line with this issue with the app, the way we can understand privacy better is to collect information (anonymously) from devices so that we can see if the settings we provide make sense, if the owners care about privacy at all, etc.

[yyzhuang]

As a starting point, getting familiar with how to setup a clearinghouse, and read Django tutorials would help