Update README.md

Added brief description of the project

README.md

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 # FeatherLite
-A light weight (feather lite) toolkit to aid in MVVM development for WIndows Phone 8+ systems. Inspired by MVVMLight, but uses a sub set
+A light weight (feather lite) toolkit to aid in MVVM development for WIndows Phone 8+ systems. Inspired by MVVMLight, but mostly independent implementation. I created this while developing Windows Phone applications, so I have not tested them in any other .Net flavors (like WPF, WinRT etc). It provides following features:
+
+• A Bindable Object for UI and an Observable Object for Models with easy to use Property CHange notifier.
+Just derive your classes from one of them, and call your setter
+
+    bool _isInEditMode;
+    public bool IsInEditMode
+    {
+        get { return _isInEditMode; }
+        set { SetProperty (ref _isInEditMode, value); }
+    }
+
+`SetProperty` will take care of raising both `INotifyPropertyChanging` and `INotifyPropertyChanged` interface clients.
+
+• An easy to use Application settings helper which lets you save a setting and retrive it in any class as easy as 
+
+    public static bool AutoPaused
+    {
+        get { return AppSettings.GetValue<bool> (DefaultValue: false); }
+        set
+        {
+            if ( AppSettings.SetValue (Value: value) )
+                AppSettings.Save ();
+        }
+    }
+
+• Async helper class for storing /retrieving files to and from Application Isolated storage.
+
+• Bindable application bar/commands
+
+• Navigation service
+
+*Known Issues*:
+The messaging component creates a hard reference to all classes registering for messages (as an action delegate is passed as an input). I was not able to find a workaround which suited rest of my design. I just called CleanUp in every class and took care of Unregistring from messages.