feat(Media): add binding component Avatar & AvatarGroup.

Author: r17x

README.md

@@ -207,7 +207,8 @@ All of Style Props implementation is write in File:[Chakra__MakeProps.res](https
 - [ ] LinkOverlay
 
 ### Media and Icons
-- [ ] Avatar
+- [x] Avatar
+  - [x] AvatarGroup
 - [x] Icon
 - [x] Image
 

src/Chakra.res

@@ -97,8 +97,8 @@ module Heading = Chakra__Heading
 // module LinkOverlay = Chakra__LinkOverlay;
 
 // ### Media and Icons
-// TODO Media and Icons
-// module Avatar = Chakra__Avatar;
+module Avatar = Chakra__Avatar
+module AvatarGroup = Chakra__AvatarGroup
 module Icon = Chakra__Icon
 module Image = Chakra__Image