Initial.

kotlin-tunes-skeleton/src/main/kotlin/tunes/SongCollection.kt

@@ -0,0 +1,23 @@
+package tunes
+
+class SongCollection {
+/*
+    private class Song(val name: String, val tune: Tune)
+
+    private class TreeNode(var song: Song, var left: TreeNode? = null, var right: TreeNode? = null)
+
+    private var root: TreeNode? = null
+
+    fun addSong(name: String, tune: Tune) {
+        TODO("Implement as part of Question 6")
+    }
+
+    fun getTune(name: String): Tune {
+        TODO("Implement as part of Question 6")
+    }
+
+    fun getSongNames(): List<String> {
+        TODO("Implement as part of Question 6")
+    }
+*/
+}