README update

README.md

@@ -1,14 +1,25 @@
 #CryptoSwift
-Crypto related helpers for Swift implemented in Swift.
+Crypto related helpers for [Swift](https://developer.apple.com/swift/) implemented in Swift. ([#PureSwift](https://twitter.com/hashtag/pureswift))
 
 ##Requirements
 Good mood
 
+##Features
+
+- Easy to use
+- Convenience extensions
+
+######what implemented
+- MD5
+- SHA1
+
 ##Usage
 
+Generally you should use `CryptoHash` enum or convenience extensions
+
     import CryptoSwift
     
-    /* Calculate hash for array of bytes */
+    /* CryptoHash enum usage */
     var data:NSData = NSData(bytes: [49, 50, 51] as [Byte], length: 3)
     if let data = CryptoHash.md5.hash(data) {
         println(data.hexString)
@@ -18,6 +29,7 @@ Good mood
 	
 	let hash = MD5(data).calculate()
 	let hash = data.md5()
+	let hash = data.sha1()
 	
 srtaight from String