Update README (eugenp#3953)

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core-java/README.md

@@ -142,4 +142,5 @@
 - [Guide to Inheritance in Java](http://www.baeldung.com/java-inheritance)
 - [Guide to Externalizable Interface in Java](http://www.baeldung.com/java-externalizable)
 - [The “final” Keyword in Java](http://www.baeldung.com/java-final)
+- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
 

core-kotlin/README.md

@@ -21,3 +21,4 @@
 - [Try-with-resources in Kotlin](http://www.baeldung.com/kotlin-try-with-resources)
 - [HTTP Requests with Kotlin and khttp](http://www.baeldung.com/kotlin-khttp)
 - [Kotlin Dependency Injection with Kodein](http://www.baeldung.com/kotlin-kodein-dependency-injection)
+- [Objects in Kotlin](http://www.baeldung.com/kotlin-objects)