Update README.md

Author: ajeetraina

workshop/dockerdesktop/mac/install/README.md

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 # Installing Docker Desktop for Mac
 
+Docker Desktop is free for small businesses (fewer than 250 employees AND less than $10 million in annual revenue), personal use, education, and non-commercial open-source projects. Otherwise, it requires a paid subscription for professional use. Paid subscriptions are also required for government entities. When downloading and installing Docker Desktop, you are asked to agree to the Docker Subscription Service Agreement
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 ## Download Docker Desktop for Mac