docs: Add npx and yarn dlx initialization instructions to README.

Author: netshdev

README.md

@@ -15,10 +15,18 @@ Turn your AI assistant into a senior engineer that knows your team's rules.
 
 Initialize standardized rules in your project with a single command. **No installation required.**
 
+### Using bash
+
 ```bash
 npx codingwithagent init
 ```
 
+### Using yarn
+
+```bash
+yarn dlx codingwithagent init
+```
+
 The interactive CLI will guide you through the setup:
 
 ```