update link in Readme

Author: ivanmmarkovic

README.md

@@ -4,3 +4,8 @@ Code from Problem Solving with Algorithms and Data Structures using Python
 [book website](https://runestone.academy/runestone/books/published/pythonds/index.html)
 
 [videos](https://teklern.blogspot.com/p/blog-page.html)
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+
+### [Graphs](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs)
+- [dijkstra algorithm](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra)
+    - [Priority Queue](https://github.com/ivanmmarkovic/Problem-Solving-with-Algorithms-and-Data-Structures-using-Python/tree/master/graphs/dijkstra/priority-queue-impl-adjacency-map)