docs: updated docs for v3

docs/v3/README.md

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+<object data="../maska.svg" type="image/svg+xml" style="max-width: 90%"></object>
+
+---
+
+**Maska** is a simple zero-dependency input mask library.
+
+You can use it with vanilla javascript or with your favorite framework. Out of the box there is integration with Vue 2/3, Svelte and Alpine.js, but you can integrate it into any framework.
+
+> ❤️ [Please support](https://boosty.to/beholdr) Maska future development!
+
+## Main components
+
+- `Mask` — class for mask processing (can be used to mask any string)
+- `MaskInput` — handles interaction with the `<input>` element
+- Directives `vMaska` for Vue, `xMaska` for Alpine.js and `maska` action for Svelte
+
+## Live Demo
+
+<iframe height="300" style="width: 100%;" scrolling="no" title="Maska demo" src="https://codepen.io/beholdr/embed/QWREEMY?default-tab=html%2Cresult&editable=true" frameborder="no" loading="lazy" allowtransparency="true" allowfullscreen="true">
+  See the Pen <a href="https://codepen.io/beholdr/pen/QWREEMY">
+  Maska demo</a> by Alexander (<a href="https://codepen.io/beholdr">@beholdr</a>)
+  on <a href="https://codepen.io">CodePen</a>.
+</iframe>