Feature/kotlin map examples (#2220)

* Add project for hibernate immutable article
Add Event entity
Add hibernate configuration file
Add hibernateutil for configuration
Add test to match snippets from article

* Update master

* Add Kotlin test to convert list to map

* Add additional associate methods on test for ListToMap file

kotlin/src/test/kotlin/com/baeldung/kotlin/ListToMapTest.kt

@@ -8,6 +8,7 @@ class ListToMapTest {
     val user1 = User("John", 18, listOf("Hiking, Swimming"))
     val user2 = User("Sara", 25, listOf("Chess, Board Games"))
     val user3 = User("Dave", 34, listOf("Games, Racing sports"))
+    val user4 = User("John", 30, listOf("Reading, Poker"))
 
     @Test
     fun givenList_whenConvertToMap_thenResult() {
@@ -32,4 +33,42 @@ class ListToMapTest {
 
         assertTrue(myMap.get("a") == "a")
     }
+
+    @Test
+    fun givenStringList_whenAssociate_thenResult() {
+        val myList = listOf("a", "b", "c", "c", "b")
+        val myMap = myList.associate{ it to it }
+
+        assertTrue(myMap.get("a") == "a")
+    }
+
+    @Test
+    fun givenStringList_whenAssociateTo_thenResult() {
+        val myList = listOf("a", "b", "c", "c", "b")
+        val myMap = mutableMapOf<String, String>()
+
+        myList.associateTo(myMap) {it to it}
+
+        assertTrue(myMap.get("a") == "a")
+    }
+
+    @Test
+    fun givenStringList_whenAssociateByTo_thenResult() {
+        val myList = listOf(user1, user2, user3, user4)
+        val myMap = mutableMapOf<String, Int>()
+
+        myList.associateByTo(myMap, {it.name}, {it.age})
+
+        assertTrue(myMap.get("Dave") == 34)
+    }
+
+    @Test
+    fun givenStringList_whenAssociateByToUser_thenResult() {
+        val myList = listOf(user1, user2, user3, user4)
+        val myMap = mutableMapOf<String, User>()
+
+        myList.associateByTo(myMap) {it.name}
+
+        assertTrue(myMap.get("Dave")!!.age == 34)
+    }
 }