Update README.md

Author: ss892714028

README.md

@@ -17,3 +17,8 @@ Breadth First Search is unweighted and guarantee a optimal path.
 ### Depth First Search
 Depth First Search is unweighted and does not guarantee a optimal path.
 ![](https://github.com/ss892714028/Maze-PathFinder-Visualization-Python/blob/master/gifs/dfs-nonoptimal.gif)
+
+### A star (A*)
+A* is weighted and guarantee a optimal path.
+![](https://github.com/ss892714028/Maze-PathFinder-Visualization-Python/blob/master/gifs/astar.gif)
+