Update README.md

Author: emran-hsb

README.md

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 # gpm_visualizer
 Visualizing and analyzing the precipitation data downloaded from NASA GPM data files.
 
+https://github.com/emran-hsb/gpm_visualizer
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 This program is meant for visualizing and analyzing the precipitation data downloaded from NASA GPM data files.
 The expected functionalies are:
   * Downloading precipitation data (early, late, and final runs) to local drive.