Added CloneAGraph

Author: Skillz619

Clonegraph.py

@@ -0,0 +1,23 @@
+class Node:
+    def __init__(self, value):
+        self.value = value
+        self.neighbors = []
+
+    def add(self, node):
+        self.neighbors.append(node)
+
+
+visited = {}
+
+def clone(node) -> Node:
+    if node is None:
+        return None
+    new_node = Node(node.value)
+    visited[node.val] = new_node
+    for n in node.neighbors:
+        if n.val not in visited:
+            new_node.add(clone(n))
+        else:
+            new_node.add(visited[n.val])
+    return new_node
+