New App Checklist

[ormsbee]

Need to write a doc of things so we don't forget. Should mention

• import linter
• model conventions
• private API conventions
• public API conventions
• preferred way to make tests
• places where we deviate from OEP-49 (particularly how we pass around querysets)
• philosophy on small apps that encapsulate discrete pieces of functionality
• philosophy on extensible models
• boundaries we want to enforce (e.g. leaving authorization out)

(other folks please feel free to add stuff)