Added a nice GitHub badge to show if the lab is being built correctly or not.

Author: dfreniche

README.md

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+[![.github/workflows/deploy.yml](https://github.com/mongodb-developer/sql-to-query-api-lab/actions/workflows/deploy.yml/badge.svg?branch=main)](https://github.com/mongodb-developer/sql-to-query-api-lab/actions/workflows/deploy.yml)
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 # SQL to MongoDB Query API
 
 Workshop Docs hosted at: https://mdb.link/query-api-lab