Add installation and brief example of usage

README.md

@@ -1,2 +1,18 @@
 # GeoDistance.js
 ### A Node.js module which takes 2 Lat+Lng (Geolocation) points and returns the distance between the two points in Meters
+
+Installation
+-----
+npm install geo-distance-js
+
+----
+Function
+getDistance(toLat, toLng, fromLat, fromLng);
+
+Add the module as a variable in your .js file
+
+var dist = require('geo-distance-js');
+
+Run the function with 
+
+dist.getDistance(toLat, toLng, fromLat, fromLng);