Updated readme

Author: Kuldeep Kapade

README.md

@@ -1 +1,14 @@
-# OpenAdViewability
+OpenAdViewability
+======
+
+This JavaScript SDK is an open source version to track viewability metric for any ad element based on the MRC Viewability guidelines - http://mediaratingcouncil.org/081815%20Viewable%20Ad%20Impression%20Guideline_v2.0_Final.pdf. This implementation is extended from OpenVV - https://github.com/InteractiveAdvertisingBureau/openvv and developed by AdsNative.com
+
+## Features
+* According to MRC guidelines it tracks the viewability of an ad if the ad is at least 50% viewable for at least 1 second.
+* If the ad unit is larger than 242,500 pixel area then it considers only at least 30% ad viewable for at least 1 second.
+* Unlike OpenVV it doesn't require Flash support from the browser. It tracks the viewability across all web browser platforms.
+* It tracks viewability even if the ad element is within the friendly-iframe. 
+
+Note: It does not track 'Viewable Video Impression'. It only tracks viewable impressions for ad element as a whole.
+
+## Usage