Update README.md (#12)

Author: akshowhini

README.md

@@ -27,6 +27,9 @@ from ExtractTable import *
 et_sess = ExtractTable(api_key=YOUR_API_KEY)        # Replace your VALID API Key here
 print(et_sess.check_usage())        # Checks the API Key validity as well as shows associated plan usage 
 table_data = et_sess.process_file(filepath=Location_of_Image_with_Tables, output_format="df")
+
+# To process PDF, make use of pages ("1", "1,3-4", "all") params in the read_pdf function
+table_data = et_sess.process_file(filepath=Location_of_PDF_with_Tables, output_format="df", pages="all")
 ```
 [Detail Code Here](example-code.ipynb)