updated readme

Author: stevengill

README.md

@@ -1,2 +1,5 @@
 cordova-plugin-geolocation
 ---------------------------
+To install this plugin, follow the [Command-line Interface Guide](http://cordova.apache.org/docs/en/edge/guide_cli_index.md.html#The%20Command-line%20Interface).
+
+If you are not using the Cordova Command-line Interface, follow [Using Plugman to Manage Plugins](http://cordova.apache.org/docs/en/edge/guide_plugin_ref_plugman.md.html).