updated README

README.md

@@ -1,4 +1,4 @@
-# JXRand [![Build Status](https://travis-ci.org/mankal111/JXRand.svg?branch=master)](https://travis-ci.org/mankal111/JXRand) [![Coverage Status](https://coveralls.io/repos/github/mankal111/JXRand/badge.svg?branch=master)](https://coveralls.io/github/mankal111/JXRand?branch=master)
+# JXRand [![Build Status](https://travis-ci.org/mankal111/JXRand.svg?branch=master)](https://travis-ci.org/mankal111/JXRand) [![Coverage Status](https://coveralls.io/repos/github/mankal111/JXRand/badge.svg?branch=master)](https://coveralls.io/github/mankal111/JXRand?branch=master) [![npm version](https://badge.fury.io/js/jxrand.svg)](https://badge.fury.io/js/jxrand)
 
 Javascript eXtended Random number generator
 
@@ -10,11 +10,33 @@ Javascript eXtended Random number generator
 ## Usage
 ```js
     var JXRand = require('JXRand');
+```
+
+To get a random integer between 10 and 20:
+
+```js
+    var randomInt = JXRand.getNumber({min: 10, max: 20, type: 'integer'});
+```
 
-    var randomInt = JXRand.getInteger(0, 10); // A random integer in the interval [0, 10]
-    var randomFloat = JXRand.getFloat(0, 2); // A random float in the interval [0, 2]
+The `type` property is optional with a default value of `float`.
+For now the supported types are `integer` and `float`.
+
+To get a random interval, with integer endpoints between 0 and 100 and length between 10 and 50:
+
+```js
+    var randomInterval = JXRand.getInterval({
+        min: 0,
+        max: 100,
+        minLength: 10,
+        maxLength: 50,
+        type: 'integer'
+    });
 ```
 
+A possible value of `randomInterval` is `[43, 75]`.
+
+The `minLength`, `maxLength` and `type` properties are optional.
+
 ## Tests
 ```
     npm test