Garmin Provider
Hey guys, total noob here, so not even sure how to do this. I am using Grant for Twitter and I went ahead and used it for Garmin as well and it did just fine. Keep up the good work. I greatly appreciate having Grant available. `oauth.json`

```json
"garmin": {
  "request_url": "https://connectapi.garmin.com/oauth-service/oauth/request_token",
  "authorize_url": "https://connect.garmin.com/oauthConfirm",
  "access_url": "https://connectapi.garmin.com/oauth-service/oauth/access_token",
  "oauth": 1
}
```

In my config.json file:

```json
{
  "defaults": {
    "origin": "http://localhost:3000",
    "transport": "session"
  },
  "garmin": {
    "key": "...",
    "secret": "...",
    "callback": "/garmin/redirect"
  }
}
```