Adds AVL tree into workspace

Author: kelvinlauKL

SwiftAlgorithmClub/.swiftlint.yml

@@ -54,6 +54,7 @@ disabled_rules:
   - line_length
   - force_try
   - force_cast
+  - function_body_length
 
 file_length: 450
 nesting:

SwiftAlgorithmClub/AVLTree.playground/Contents.swift

@@ -0,0 +1,27 @@
+//: Playground - noun: a place where people can play
+
+let tree = AVLTree<Int, String>()
+
+tree.insert(key: 5, payload: "five")
+print(tree)
+
+tree.insert(key: 4, payload: "four")
+print(tree)
+
+tree.insert(key: 3, payload: "three")
+print(tree)
+
+tree.insert(key: 2, payload: "two")
+print(tree)
+
+tree.insert(key: 1, payload: "one")
+print(tree)
+print(tree.debugDescription)
+
+let node = tree.search(input: 2)   // "two"
+
+tree.delete(key: 5)
+tree.delete(key: 2)
+tree.delete(key: 1)
+tree.delete(key: 4)
+tree.delete(key: 3)