Add spotify example

Author: Kadi Kraman

README.md

@@ -42,6 +42,7 @@ These providers implement the OAuth2 spec, but are not OpenID providers, which m
 - [GitHub](https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps/) ([Example configuration](./docs/config-examples/github.md))
 - [Slack](https://api.slack.com/authentication/oauth-v2) ([Example configuration](./docs/config-examples/slack.md))
 - [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))
 
 ## Why you may want to use this library
 

docs/config-examples/spotify.md

@@ -0,0 +1,20 @@
+# Spotify
+
+If you don't already have a slack app, create it [here](https://developer.spotify.com/dashboard/applications).
+
+Open your app, go to settings and add a redirect uri, e.g. `com.myapp://oauth`.
+
+```js
+const config = {
+  clientId: '<client_id>', // available on the app page
+  clientSecret: '<client_secret>', // click "show client secret" to see this
+  redirectUrl: 'com.myapp://oauth', // the redirect you defined after creating the app
+  scopes: ['user-read-email', 'playlist-modify-public', 'user-read-private'], // the scopes you need to access
+  serviceConfiguration: {
+    authorizationEndpoint: 'https://accounts.spotify.com/authorize',
+    tokenEndpoint: 'https://accounts.spotify.com/api/token',
+  },
+};
+
+const authState = await authorize(config);
+```