Add syntax highlighting on Compose compiler metrics code block

Author: SimonMarquis

README.md

@@ -150,7 +150,7 @@ Then copy the resulting baseline profile from the emulator to [`app/src/main/bas
 
 Run the following command to get and analyse compose compiler metrics:
 
-```
+```bash
 ./gradlew assembleRelease -PenableComposeCompilerMetrics=true -PenableComposeCompilerReports=true
 ```