Update README.md

Author: Nick

README.md

@@ -1,2 +1,11 @@
 # AVL_tree
 AVL tree realisation using Python 3
+
+In this realisation of AVL tree I have the following methods:
+     - create nodes in the tree (the tree creates nodes and checks it self
+     to keep the tree balanced);
+     - find height of the tree;
+     - search nodes in the tree;
+     - display all nodes in the tree;
+     - delete nodes in the tree (keeping the tree balanced);
+     - display number of all nodes in the tree;