Update license headers for all files.

Source/Framework/Algorithms/DepthFirstSearch.cs

@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
+// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
+
+using System;
 using Framework.Collections;
 
 namespace Framework.Algorithms

Source/Framework/Algorithms/DijkstraShortestPath.cs

@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
+// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
+
+using System;
 using System.Collections.Generic;
 using Framework.Collections;
 

Source/Framework/Algorithms/EdgeWeightedDigraph.cs

@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
+// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
+
+using System;
 using System.Collections.Generic;
 using System.Text;