Update README (#3953)

* BAEL-973: updated README

* BAEL-1069: Updated README

* BAEL-817: add README file

* BAEL-1084: README update

* BAEL-960: Update README

* BAEL-1155: updated README

* BAEL-1041: updated README

* BAEL-973: Updated README

* BAEL-1187: updated README

* BAEL-1183: Update README

* BAEL-1133: Updated README

* BAEL-1098: README update

* BAEL-719: add README.md

* BAEL-1272: README update

* BAEL-1272: README update

* BAEL-1196: Update README

* BAEL-1328: Updated README

* BAEL-1371: Update README.md

* BAEL-1371: Update README.md

* BAEL-1278: Update README

* BAEL-1326: Update README

* BAEL-399: Update README

* BAEL-1297: Update README

* BAEL-1218: README

* BAEL-1148 README update

* BAEL-113 README

* BAEL-1158 README

* BAEL-1539: Update README

* BAEL-1507 README update

* BAEL-1178 README updated

* BAEL-1462 README

* BAEL-1491 README update

* BAEL-1612: README update

* BAEL-1510: Updated README

* BAEL-1169 README

* BAEL-1598: README update

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)