BAEL-7390 - add/fix links (#4697)

* Create README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.MD

* Create README.md

* Update README.md

* Create README.md

* Create README.md

* Update README.md

* Update README.md

core-java/README.md

@@ -167,3 +167,5 @@
 - [How to Get the File Extension of a File in Java](http://www.baeldung.com/java-file-extension)
 - [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
 - [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
+- [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
+- [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)

core-kotlin/README.md

@@ -33,3 +33,4 @@
 - [Kotlin String Templates](http://www.baeldung.com/kotlin-string-template)
 - [Java EE 8 Security API](http://www.baeldung.com/java-ee-8-security)
 - [Kotlin with Ktor](http://www.baeldung.com/kotlin-ktor)
+- [Working with Enums in Kotlin](http://www.baeldung.com/kotlin-enum)

maven-archetype/README.md

@@ -0,0 +1,4 @@
+### Relevant Articles: 
+================================
+
+- [Guide to Maven Archetype](http://www.baeldung.com/maven-archetype)

spring-boot-bootstrap/README.md

@@ -1,3 +1,4 @@
 ### Relevant Articles:
 - [Bootstrap a Simple Application using Spring Boot](http://www.baeldung.com/spring-boot-start)
 - [Spring Boot Dependency Management with a Custom Parent](http://www.baeldung.com/spring-boot-dependency-management-custom-parent)
+- [Thin JARs with Spring Boot](http://www.baeldung.com/spring-boot-thin-jar)

spring-boot-mvc/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Guide to the Favicon in Spring Boot](http://www.baeldung.com/spring-boot-favicon)

spring-boot-ops/README.md

@@ -0,0 +1,4 @@
+### Relevant Articles: 
+================================
+
+- [Spring Boot Console Application](http://www.baeldung.com/spring-boot-console-app)

spring-boot-persistence/README.MD

@@ -1,3 +1,3 @@
 ### Relevant Articles:
 
-- [Spring Boot with multiple SQL import files](http://www.baeldung.com/spring-Boot-with-multiple-SQL-import-files)
+- [Spring Boot with Multiple SQL Import Files](http://www.baeldung.com/spring-boot-sql-import-files)

spring-thymeleaf/README.md

@@ -16,6 +16,7 @@
 - [Iteration in Thymeleaf](http://www.baeldung.com/thymeleaf-iteration)
 - [Working With Arrays in Thymeleaf](http://www.baeldung.com/thymeleaf-arrays)
 - [Spring with Thymeleaf Pagination for a List](http://www.baeldung.com/spring-thymeleaf-pagination)
+- [Working with Select and Option in Thymeleaf](http://www.baeldung.com/thymeleaf-select-option)
 
 ### Build the Project
 

spring-webflux-amqp/README.md

@@ -0,0 +1,4 @@
+### Relevant Articles: 
+================================
+
+- [Spring AMQP in Reactive Applications](http://www.baeldung.com/spring-amqp-reactive)

testing-modules/mockito/README.md

@@ -18,3 +18,4 @@
 - [Hamcrest File Matchers](http://www.baeldung.com/hamcrest-file-matchers)
 - [Hamcrest Custom Matchers](http://www.baeldung.com/hamcrest-custom-matchers)
 - [Hamcrest Common Core Matchers](http://www.baeldung.com/hamcrest-core-matchers)
+- [Testing Callbacks with Mockito](http://www.baeldung.com/mockito-callbacks)