Update README

Fix #18

Author: astares

README.md

@@ -1,3 +1,12 @@
 # Cryptography
 
 [![Build Status](https://travis-ci.org/pharo-contributions/Cryptography.svg?branch=master)](https://travis-ci.org/pharo-contributions/Cryptography)
+
+## Quick Start 
+
+```Smalltalk
+Metacello new
+  baseline: 'Cryptography';
+  repository: 'github://pharo-contributions/Cryptography';
+  load.
+```