feat: documentation for imgur (#977)

Author: faizplus

README.md

@@ -51,6 +51,7 @@ These providers implement the OAuth2 spec, but are not OpenID providers, which m
 - [Strava](https://developers.strava.com/docs/authentication) ([Example configuration](./docs/config-examples/strava.md))
 - [Spotify](https://developer.spotify.com/documentation/general/guides/authorization-guide/) ([Example configuration](./docs/config-examples/spotify.md))
 - [Unsplash](https://unsplash.com/documentation) ([Example configuration](./docs/config-examples/unsplash.md))
+- [Imgur](https://apidocs.imgur.com) ([Example configuration](./docs/config-examples/imgur.md))
 
 ## Why you may want to use this library
 

docs/config-examples/imgur.md

@@ -0,0 +1,24 @@
+# Imgur
+
+Imgur provides an OAuth 2.0 endpoint for logging in with a Imgur user's credentials. You'll need to first [register your Imgur application here](https://api.imgur.com/oauth2/addclient). See [this comment](https://github.com/FormidableLabs/react-native-app-auth/issues/516#issuecomment-2115465572) for detailed setup guide.
+
+Please note:
+
+* Imgur does not provide a OIDC discovery endpoint, so `serviceConfiguration` is used instead.
+
+```js
+// your configuration should look something like this
+const config = {
+  issuer: 'https://api.imgur.com/oauth2/',
+  clientId: 'abc79a5abcdb30e', // your client id
+  redirectUrl: encodeURIComponent('com.myapp://oauth/callback'), // must wrap it in encodeURIComponent 
+  scopes: [],
+  serviceConfiguration: {
+    authorizationEndpoint: 'https://api.imgur.com/oauth2/authorize',
+    tokenEndpoint: 'https://api.imgur.com/oauth2/token',
+  },
+};
+
+// Log in to get an authentication token
+const authState = await authorize(config);
+```