Update README.md

README.md

@@ -8,18 +8,25 @@ You can use this code with the Google Authenticator mobile app or the Authy mobi
 * Browse the code on the [git repository](https://github.com/j256/two-factor-auth).  [![CircleCI](https://circleci.com/gh/j256/two-factor-auth.svg?style=svg)](https://circleci.com/gh/j256/two-factor-auth)
 * Maven packages are published via the [maven central repo](http://repo1.maven.org/maven2/com/j256/two-factor-auth/two-factor-auth/).	
 
-To get this to work you:
+## To get this to work you:
 
 1. Use `generateBase32Secret()` to generate a secret key for a user.
 2. Store the secret key in the database associated with the user account.
 3. Display the QR image URL returned by `qrImageUrl(...)` to the user.
 4. User uses the image to load the secret key into his authenticator application.
 
-Whenever the user logs in:
+## Whenever the user logs in:
 
 1. The user enters the number from the authenticator application into the login form.
 2. Read the secret associated with the user account from the database.
 3. The server compares the user input with the output from `generateCurrentNumberString(...)`.
 4. If they are equal then the user is allowed to log in.
 
 For more details, see the [example program](https://github.com/j256/two-factor-auth/blob/master/src/test/java/com/j256/twofactorauth/TwoFactorAuthExample.java).
+
+## Sample QR Image
+
+The following is a sample QR image generated by GoogleAPIs URL.  It is the QR code for the base-32 encoded
+secret `"NY4A5CPJZ46LXZCP"`.  See the [example program](https://github.com/j256/two-factor-auth/blob/master/src/test/java/com/j256/twofactorauth/TwoFactorAuthExample.java) for more details.
+
+![Sample QR Image](https://chart.googleapis.com/chart?chs=200x200&cht=qr&chl=200x200&chld=M|0&cht=qr&chl=otpauth://totp/[email protected]%3Fsecret%3DNY4A5CPJZ46LXZCP)