add data to bst code example

Example: binary search tree insert java

public static Node insert(Node root, int x){
    if (root == null)
        return new Node(x);
    else if(x>root.getData())
        root.setRightChild(insert(root.getRightChild(),x));
    else
        root.setLeftChild(insert(root.getLeftChild(),x));
    return root;
}