Update README.md

Author: coderuhaan2004

README.md

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 # A_star_on_map
 I have implemented A* algorithm on geospatial data. This implementation does not give practical shortest path as there are lot of constraints on-road which are not considered. Many such consideration can be made to make it more accurate.
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+1. Make sure the all the mentioned python libraries are installed.
+2. Run the '''main.py''' or '''main_with_example.py''' file on IDE.