feat: preview added

Author: jsi1v4

README.md

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-![cover](https://raw.githubusercontent.com/jsi1v4/jsi1v4/main/assets/cover.png)
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 # Jsi1v4 Web Page
 
 My bio webpage, built in html/css/js vanilla, [take a look](https://www.josepaulo.dev) 🖖.
 
 > Notes: use babel to build, js in ES2017 😎!
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+![**Preview**](preview.gif)
+
+---
+
+Keep calm and code on 🤘.