rename spring-all module

* rename existing spring-core-2 to spring-core-3
* rename spring-all to spring-core-2

spring-core-2/README.md

@@ -1,3 +1,23 @@
-## Relevant Articles:
+=========
 
-- [Understanding getBean() in Spring](https://www.baeldung.com/spring-getbean)
+## Spring General Example Project
+
+This project is used to replicate Spring Exceptions only.
+
+### The Course
+
+The "REST With Spring" Classes: http://bit.ly/restwithspring
+
+### Relevant articles:
+
+- [Guide to Spring @Autowired](http://www.baeldung.com/spring-autowire)
+- [Spring Profiles](http://www.baeldung.com/spring-profiles)
+- [A Spring Custom Annotation for a Better DAO](http://www.baeldung.com/spring-annotation-bean-pre-processor)
+- [Running Setup Data on Startup in Spring](http://www.baeldung.com/running-setup-logic-on-startup-in-spring)
+- [Quick Guide to Spring Bean Scopes](http://www.baeldung.com/spring-bean-scopes)
+- [Custom Scope in Spring](http://www.baeldung.com/spring-custom-scope)
+- [@Order in Spring](http://www.baeldung.com/spring-order)
+- [Spring @Primary Annotation](http://www.baeldung.com/spring-primary)
+- [Spring Events](https://www.baeldung.com/spring-events)
+- [Spring Null-Safety Annotations](https://www.baeldung.com/spring-null-safety-annotations)
+- [Using @Autowired in Abstract Classes](https://www.baeldung.com/spring-autowired-abstract-class)