updated readme

Author: maxazan

README.md

@@ -1,6 +1,20 @@
-jquery-treegrid
-===============
-
 TreeGrid plugin for jQuery
+==================
+
+See more information at http://maxazan.github.io/jquery-treegrid
+
+##Installation
+
+###Using npm
+```
+npm install jquery-treegrid
+```
+
+###Using bower
+```
+bower install jquery-treegrid
+```
+
+###From source
 
-See more information at http://maxazan.github.io/jquery-treegrid
+Download [source](https://github.com/maxazan/jquery-treegrid/archive/master.zip) from github.com