[BAEL-9552] - Create spring-security-modules folder

spring-security-modules/spring-security-rest-custom/README.md

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+## Spring Security REST Custom
+
+This module contains articles about REST APIs with Spring Security
+
+### The Course
+
+The "REST With Spring" Classes: http://github.learnspringsecurity.com
+
+### Relevant Articles: 
+
+- [Spring Security Authentication Provider](https://www.baeldung.com/spring-security-authentication-provider)
+- [Retrieve User Information in Spring Security](https://www.baeldung.com/get-user-in-spring-security)
+- [Spring Security – Run-As Authentication](https://www.baeldung.com/spring-security-run-as-auth)