Added a link to the cipher track 2

Author: elenam

README.md

@@ -5,6 +5,7 @@ Welcome to the ClojureBridge Boston getting started page!
 * [Installfest](docs/setup.md) *Friday instructions for getting ready*
 * [Track 1: turtles](https://github.com/clojurebridge-boston/track1-turtles)
 * [Track 2: Clojure koans](https://github.com/clojurebridge-boston/track2-functional)
+* [Track 2, another option: writing and breaking simple ciphers](https://github.com/clojurebridge-boston/track2-ciphers)
 * [Track 2, additional: drawing in Quil](https://github.com/clojurebridge-boston/drawing)
 
 ### Copyright and License