docs: update npm usage (#12)

Author: paper

README.md

@@ -14,8 +14,8 @@ Starter for [Vite](https://github.com/vuejs/vite) + [VueUse](https://github.com/
 ## Installation
 
 1. Clone this repository
-2. `npm`
-3. `npm i`
+2. `npm i`
+3. `npm run dev`
 4. open http://localhost:3000 in your browser
 
 ## More Example