Add InstagramSimpleOAuth, DropboxSimpleOAuth and BoxSimpleOAuth

README.md

@@ -215,6 +215,9 @@ Awesome-iOS is an amazing list for people who need a certain feature on their ap
 * [Simplicity](https://github.com/SimplicityMobile/Simplicity) - A simple way to implement Facebook and Google login in your iOS and OS X apps. :large_orange_diamond:
 * [InstagramAuthViewController](https://github.com/Isuru-Nanayakkara/InstagramAuthViewController) - A ViewController for Instagram authentication. :large_orange_diamond:
 * [Cely](https://github.com/chaione/Cely) - Plug-n-Play login framework written in Swift. :large_orange_diamond:
+* [InstagramSimpleOAuth](https://github.com/rbaumbach/InstagramSimpleOAuth) - A quick and simple way to authenticate an Instagram user in your iPhone or iPad app.
+* [DropboxSimpleOAuth](https://github.com/rbaumbach/DropboxSimpleOAuth) - A quick and simple way to authenticate a Dropbox user in your iPhone or iPad app.
+* [BoxSimpleOAuth](https://github.com/rbaumbach/BoxSimpleOAuth) - A quick and simple way to authenticate a Box user in your iPhone or iPad app.
 
 ## Bridging
 * [RubyMotion](http://www.rubymotion.com/) - RubyMotion is a revolutionary toolchain that lets you quickly develop and test native iOS and OS X applications for iPhone, iPad and Mac, all using the Ruby language.