Update bs/balance_sheet_generator.py

Update bs/balance_sheet_generator.py (#15)

Update bs/balance_sheet_csv_to_json_converter.py (#14)

Update bs/balance_sheet_csv_to_json_converter.py (#8)

Update bs/balance_sheet_data_extractor.py (#9)

Update bs/balance_sheet_generator.py (#10)

pnl and bs changed to schedule 3 format

agent added, files name changed

Improved the structure of codebase and updated files code accordingly.