add readme

README.md

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+JSON to CSV
+=
+
+with support for nested structures
+
+Steps
+
+* place the transactions.json file in the same directory
+* adjust the flat_keys and extract_keys variables in the main.py
+* install required packages `pip install -r requirements.txt`
+* run `python3 main.py`
+* if successful will create a transactions.db (sqlite database)
+* can be used with anyother tool to convert to csv
+* one way to export to csv is is `https://www.sqlitetutorial.net/sqlite-export-csv/`