added larger code block in starter readme

Author: commit111

starter-sample/README.md

@@ -34,7 +34,10 @@ An explanation of what the env var (`API_KEY`) is, etc.
 
 ### Defang Playground
 
-Deploy your application to the defang playground by opening up your terminal and typing `defang up`.
+Deploy your application to the Defang Playground by opening up your terminal and typing:
+```bash
+defang compose up
+```
 
 ### BYOC (AWS)