docs: make skills setup non-interactive

Author: tzhangchi

README.md

@@ -14,7 +14,7 @@ Install the companion agent skill when you want an AI coding assistant to run
 the comic workflow for you:
 
 ```bash
-npx skills add LlamaGenAI/skills
+npx skills add LlamaGenAI/skills --yes
 ```
 
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