initial graph

src/graph/Edge.java

@@ -0,0 +1,6 @@
+package graph;
+
+public class Edge<T> {
+    Node<T> node1;
+    Node<T> node2;
+}

src/graph/Graph.java

@@ -0,0 +1,4 @@
+package graph;
+
+public class Graph {
+}

src/graph/Node.java

@@ -0,0 +1,5 @@
+package graph;
+
+public class Node<T> {
+    T item;
+}