Mention the JWT handbook in the introduction.

sebadoom · sebadoom · commit da2b68a52dfd · 2016-10-04T20:43:20.000-03:00
diff --git a/views/md/introduction.md b/views/md/introduction.md
@@ -1,3 +1,5 @@
+**NEW:** get the [JWT Handbook for free](https://auth0.com/e-books/jwt-handbook) and learn JWTs in depth!
+
 ## What is JSON Web Token?
 JSON Web Token (JWT) is an open standard ([RFC 7519](https://tools.ietf.org/html/rfc7519)) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the **HMAC** algorithm) or a public/private key pair using **RSA**.
 

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`@@ -1,3 +1,5 @@`
	`1`	`+NEW: get the [JWT Handbook for free](https://auth0.com/e-books/jwt-handbook) and learn JWTs in depth!`
	`2`	`+`
`1`	`3`	`## What is JSON Web Token?`
`2`	`4`	`JSON Web Token (JWT) is an open standard ([RFC 7519](https://tools.ietf.org/html/rfc7519)) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA.`
`3`	`5`