Merge pull request #10 from okta/link-to-authn-guide

Backlink to verification section of AuthN Guide

README.md

@@ -1,5 +1,7 @@
 # Okta JWT Verifier for PHP
 
+This library helps you verify tokens that have been issued by Okta.  To learn more about verification cases and Okta's tokens please read [Working With OAuth 2.0 Tokens](https://developer.okta.com/authentication-guide/tokens/)
+
 ## Installation
 The Okta JWT Verifier can be installed through composer.
 
@@ -52,4 +54,4 @@ dump($jwt->getIssuedAt(false)); // returns timestamp of issued at time
 dump($jwt->getExpirationTime()); //returns Carbon instance of Expiration Time
 dump($jwt->getExpirationTime(false)); //returns timestamp of Expiration Time
 
-```
+```