Hangouts Direct Message Configuration

First, select Message a bot option from Find people, rooms, bots and type Timesheets

New private conversation between you and Timesheets will be created and bot will ask you for authorisation via Timesheets by typing 

login

In a response Timesheets bot will provide you Configuration message:

After signing in to the Timesheets App you will be asked to connect your Hangouts account with Timesheets:

Finally, after finished connecting accounts process you will be redirected to blank page with confirmation that the whole process went fine, and Timesheets bot should respond you with list of available commands.