Update README.md

Author: MichelLeBon

spring-security-mvc-ldap/README.md

@@ -5,7 +5,7 @@
 ### Relevant Article: 
 - [Spring Security - security none, filters none, access permitAll](http://www.baeldung.com/security-none-filters-none-access-permitAll)
 - [Spring Security Basic Authentication](http://www.baeldung.com/spring-security-basic-authentication)
-
+- [Intro to Spring Security LDAP](http://www.baeldung.com/spring-security-ldap)
 
 ### Notes
 - the project uses Spring Boot - simply run 'SampleLDAPApplication.java' to start up Spring Boot with a Tomcat container and embedded LDAP server.