Update Readme.md

Author: cggaurav

Readme.md

@@ -11,4 +11,26 @@ Installation
 See /examples for usage
 ------------
 
-Thanks to [zanox](https://npmjs.org/package/zanox)
+This example gives you the sales as of 2013-05-20
+
+```
+var zanox_req, params, zanox;
+
+zanox_req = require('zanox_js');
+
+zanox = zanox_req("52D8E7B48B9A34ED7941", "c0923f577D074C+fa0caa6e2890944/B355aFc45");
+
+params = {
+  datetype: 'modifiedDate',
+  state: 'approved'
+};
+
+zanox.getAllSalesOfDate('2013-05-20', params, function(err, data) {
+  if (err != null) {
+    return console.log('error', err);
+  }
+  return console.log('%j', data);
+});
+```
+
+Thanks to [zanox](https://npmjs.org/package/zanox)