Use session#create
Add help detail
Add routes
Remove test for session controller
Change app root page
Change to single quote
Wrong syntax h1
Rename session controller => sessions controller
Add provider auth route name
Add register url
Callback is post
Remove csrf verify

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Find or create user
Add current_user method
Remove user_id from message request
Route signout, auth_failure
Use rails logger for omniauth logger
Add user_id after cleaning params
Add body area
Move above helper method declair