create readme.md

Author: sagnik-p

JSON-to-CSV/readme.md

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+# JSON to CSV
+
+This python script converts a JSON file to CSV file
+
+Data stored in json format is used for transferring data
+Data in csv format is mostly used for storing / reading data
+This script converts the .json file to .csv file
+
+
+The default output is 'output.csv'
+>the file path and name can be changed