Added playground contents.

Author: ViktorSimko

B-Tree/BTree.playground/Contents.swift

@@ -8,3 +8,19 @@ bTree.insertValue(1, forKey: 1)
 bTree.insertValue(2, forKey: 2)
 bTree.insertValue(3, forKey: 3)
 bTree.insertValue(4, forKey: 4)
+
+bTree.valueForKey(3)
+bTree[3]
+
+bTree.removeKey(2)
+
+bTree.traverseKeysInOrder {
+  key in
+  print(key)
+}
+
+bTree.numberOfKeys
+
+bTree.order
+
+bTree.inorderArrayFromKeys()