Update README.md

Author: san089

Data_Api_to_Postgres/README.md

@@ -2,6 +2,23 @@
 ## Overview 
 This project is to build a simple ETL pipeline to fetch real-time data from an open source API and store that data into a database. For this case we have used Yelp FUSION API as the open source API available and for database we used Postgres. 
 
+## Config File
+```
+[KEYS]
+CLIENT_KEY=<YOUR CLIENT KEY>
+API_KEY=<YOUR API KEY>
+
+
+[DATABASE]
+host=<HOST NAME>
+database=<DB NAME>
+username=<USER NAME>
+password=<PASSWORD>
+port=<PORT>
+
+```
+
+
 ## Files
 ```
 auth.py - Contains configuration variable for making HTTP Request