better description of sample

Author: commit111

samples/react/README.md

@@ -2,7 +2,8 @@
 
 [![1-click-deploy](https://defang.io/deploy-with-defang.png)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-react-template%26template_owner%3DDefangSamples)
 
-A minimal React app that uses Vite, running on Defang. 
+This sample shows how to get a simple React app up and running with Defang. 
+It includes Vite and ESLint, which are common build tools for React development. 
 
 ## Prerequisites