Update README.md

Author: vincentdelitz

README.md

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-# Passkey integration example for Java Spring Boot
+# Passkey-First Authentication with Java Spring Boot and Corbado
 
 This is a sample implementation of a Java Spring Boot application that offers passkey authentication. For simple passkey-first authentication, the Corbado web component is used.
 
+Please see the [full blog post](https://www.corbado.com/blog/passkeys-java-spring-boot) to understand the detailed steps needed to integrate passkeys into Java Spring Boot apps.
+
 ## File structure
 
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