Update README.md

README.md

 # FAIRevaluatorHelper
+This helper service is used to validate PID and file format.
 
-This is a sub project for FAIR evaluator service
+First install all the required packages.
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+Then run the app.py file 
+`python3 app.py`
+
+For PID validation use the endpoint "/pidvalidation" and for file format use "/mimevalidation" endpoint.