Update README.md

Author: seventhmoon

README.md

@@ -1,5 +1,6 @@
 ### Welcome to GeoIp-android
 This is a wrapper of [IP-API](http://ip-api.com/json) for Android platform using Volley.
+In simple words, get your location information by IP address.
 
 ### Sample Application
 Sample Application is included in [app](https://github.com/seventhmoon/GeoIp-android/tree/master/app)