Merge pull request #39 from squaredup/jame2O-issue35

Author: clarkd

plugins/Spotify/v1/docs/README.md

@@ -1,2 +1,6 @@
 # Before you start
-To use the Spotify data source, you will need to create an application via the Spotify Developer portal. [Learn more](https://developer.spotify.com/documentation/web-api/tutorials/getting-started#create-an-app).
+To use the Spotify data source, you will need to create an application via the Spotify Developer portal. [Learn more](https://developer.spotify.com/documentation/web-api/tutorials/getting-started#create-an-app).  
+You will need to specify a **Redirect URI** in order to set up your application. Please copy your desired URL from the following:  
+  
+EU Geo: https://eu.app.squaredup.com/settings/pluginsoauth2  
+US Geo: https://app.squaredup.com/settings/pluginsoauth2