- extending ArrayObject class

- adding some phpunit tests.

readme.md

@@ -4,7 +4,8 @@ Are you tired from casting objects and arrays to each other? Don't do that anymo
 
 1. You can access array items using `->` or `['']` syntax.
 2. You will get `null` if an index does not exists (instead of a nasty notification!)
-3. You can specify a default value for missing indexes. 
+3. You can specify a default value for missing indexes.
+4. It extends PHP ArrayObject class. So you can use its methods. 
 
 * The class (`Ary()`) requires PHP 5.4 or newer.
 * The helper function (`ary()`) requires PHP 5.6 or newer. 
@@ -31,3 +32,12 @@ $ary['newItem']=20;
 
 count($ary); //returns 3
 $ary->all(); // returns simple php array;
+~~~~~~
+
+
+Installation
+============
+
+    composer require salarmehr/ary
+    
+