Create user and send 'set password' email from another application

Hi,

I have interesting design which needs to be implemented:

1. There is mvc5 application (MainApp) where users can log in (want to use identity)

2. Users have login/forgot password functionality. They cannot register using MainApp

3. There is another mvc5 application (AdminApp). 

3.1 It is used to manage data for MainApp

3.2 It manages important data (let's call it MainDataEntity)

3.3 It uses Windows Auth with Identity

3.4 It should create user for MainApp and send 'set password' email. User should have reference to MainDataEntity

Questions:

1. How to configure Identity for MainApp? Looks like there will be needed to create custom database model.

2. What is the best way to create user and send 'set password' email in AdminApp.

Thank you in advance,

Taras