Add new step to README

README.md

@@ -15,7 +15,12 @@
 * Find your spotify username [here](https://www.spotify.com/us/account/overview/)
 
 * Now you can run `spotsync -H my_mpd_host -P 6600` where `my_mpd_host` is the host you
-  are running MPD on (host defaults to `localhost` and port defaults to 6600 if you do not include it)
+  are running MPD on (host defaults to `localhost` and port defaults to `6600` if you do not include it)
+
+* If this is the first time you are running it, it will direct you to a page in
+  your browser to grant permission for the app you just created to access your
+  private spotify playlist. You only need to do this once, and then your
+  credentials will be cached in the directory you ran `spotsync` in.
 
 * You will be prompted to grant permission to the app, once that's done, it
   will cache the credentials locally and you should be able to just run