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 This web application demonstrates how to add multi-factor authentication to your web login/signup systems, based on the Time-based One Time Password standard (TOTP).
 
+# TOTP Explantion and need of implementation 
+Explain-
+{If your website features a username+password authentication system, you owe it 
+to your users to offer 2-factor authentication (or 2fa for short) as an additional
+measure of protection for their accounts. If you're unfamiliar with 2fa, it's that
+step in the login sequence that asks the user for a (typically) 6-digit numeric code
+in order to complete user authentication. The 6 digit codes are either sent to the user's
+phone as a text message upon a login attempt or generated by an app such as Google Authenticator.
+Codes have a short validity period of typically 30 or 60 seconds. This will show you how
+to implement such a system using java in a way that is compatible with Google Authenticator.}
+
+
+Implementation-
+{Your first idea for implementing the server side component of a 2fa system might be to randomly
+generate 6 digit codes with short validity periods and send them to the user's phone in response 
+to a login attempt. One major shortcoming with this approach is that your implementation wouldn't
+be compatible with 2fa apps such as Google Authenticator which many users will prefer to use. 
+In order to build a 2fa system that is compatible with Google Authenticator, we need to know what
+algorithm it uses to generate codes. Fortunately, there is an RCF which precisely specifies the algorithm. 
+RFC 6238 describes the "time-based one-time password" algorithm, or TOTP for short. The TOTP algorithm combines
+a one time password (or secret key) and the current time to generate codes that change as time marches forward.
+RFC 6238 also includes a reference implementation in java under the commercial-friendly Simplified BSD license.
+This tutorial will show you how to use code from the RFC to build a working 2fa system that could easily be adapted 
+into your java project.}
+
+
 ## Running the example
 To run the example just execute `mvn exec:java` in the project folder.