Added lots of links to recommended reading

Author: twostraws

README.md

@@ -1,6 +1,26 @@
 # Hacking with Swift
-This is the source code to accompany the projects at [hackingwithswift.com](httpS://www.hackingwithswift.com), a free tutorial series that teaches Swift coding for iOS.
+This is the source code to accompany Hacking with Swift, [a free tutorial series that teaches Swift coding for iOS](https://www.hackingwithswift.com).
 
 All projects should be compatible with Xcode 7.0 and iOS 9. Where appropriate, separate project files have been provided so that you can follow the tutorial from scratch without having to dig around in the completed project folder.
 
-If you have questions, you can find me on Twitter [@twostraws](http://www.twitter.com/twostraws).
+If you have questions, you can find me on Twitter [@twostraws](https://www.twitter.com/twostraws).
+
+
+## Recommended links
+
+- [Buy the Hacking with Swift book and support my work](https://gumroad.com/l/hws-book-pack)
+
+- [What's new in Swift 2.2? (includes video)](https://www.hackingwithswift.com/swift2-2)
+- [What's new in Swift 2? (includes video)](https://www.hackingwithswift.com/swift2)
+- [What's new in iOS 9?](https://www.hackingwithswift.com/ios9)
+- [Free Swift example code](https://www.hackingwithswift.com/example-code)
+
+- [Error handling in Swift 2: try, catch, do and throw](https://www.hackingwithswift.com/new-syntax-swift-2-error-handling-try-catch)
+- [The guard keyword in Swift 2: early returns made easy](https://www.hackingwithswift.com/new-syntax-swift-2-guard)
+- [The defer keyword in Swift 2: try/finally done right](https://www.hackingwithswift.com/new-syntax-swift-2-defer)
+- [Availability checking in Swift 2: backwards compatibility the smart way](https://www.hackingwithswift.com/new-syntax-swift-2-availability-checking)
+
+I've also written some other free tutorials you might enjoy:
+
+- [Hacking with PHP is a free tutorial series that teaches PHP, MySQL and more](http://www.hackingwithphp.com)
+- [Hacking with React is a free tutorial series that teaches React, React Router, ES6, Jest and more](http://www.hackingwithreact.com)