update readme

README.md

@@ -2,22 +2,28 @@
 A secure cookie module for golang
 
 ```go
-//write----
+
+// securekey must be at least 16 char long
+// The key argument should be the AES key,
+// either 16, 24, or 32 bytes to select
+// AES-128, AES-192, or AES-256.
 var key = "dsdfs6dfs61dssdfsdfdsdsfsdsdllsd"
 cookies, err := NewCookies(key)
 
 var ck http.Cookie
 ck.Name = "test1"
 ck.Value = "this-is-a-test-and-more"
 
-   w  http.ResponseWriter
-   err := cookies.write(w, ck)
+//write----
+w  http.ResponseWriter
+err := cookies.write(w, ck)
 
 
-    var name = "test1"
+var name = "test1"
 
-    r    *http.Request
-    cookieValue, err := cookies.Read(r, name)
+//read----
+r    *http.Request
+cookieValue, err := cookies.Read(r, name)
 
 
 ```