[openstreetmap/openstreetmap-website] Sign in to OSM with Google account for mobile (#1256)

[Tommy Buonomo]

Hello,

I'm a developer for the [OSM Contributor](https://wiki.openstreetmap.org/wiki/OSM_Contributor) App.

I try to log the users to OpenStreetMap using OpenID, and more particulary using their google account. I've already done the half of the work using this request: 
```
https://accounts.google.com/o/oauth2/v2/auth?
response_type=code&
client_id=651529786092-6c5ahcu0tpp95emiec8uibg11asmk34t.apps.googleusercontent.com&
redirect_uri=https://www.openstreetmap.org/auth/google/callback&
scope=openid email&
login_hint=tommy.buonomo at gmail.com&
state=f6fb251c967d4563abee68751ea973c44f5a7d5672fce452
```

After that, i'm logged and I get the `OSM.oauth_token`, 
`OSM.oauth_token_secret`, 
`OSM.oauth_consumer_key`, 
`OSM.oauth_consumer_secret`,
 but I can't ask for the access token without the `oauth_verifier` parameter, which is not in the callback response.

Therefore, there is no API currently for this kind of authentification.

Thank you,

Tommy Buonomo.

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