Update README.md

Author: muryulia

Case Study #3 - Foodie-Fi/README.md

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 # Case Study #3 - Foodie-Fi :avocado:
 
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 Danny has shared the data design for Foodie-Fi and also short descriptions on each of the database tables - our case study focuses on only 2 tables but there will be a challenge to create a new table for the Foodie-Fi team.
 
 All datasets exist within the `foodie_fi` database schema.