Add screenshots

preview.md

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+# Preview
+
+Since Nuxtor is a desktop application, there is no way of showing the look and feel of the released project.
+
+What follows are each page and its functionalities:
+
+## Commands page
+
+Access the system shell
+
+<div align="center">
+<img src="./public/page-commands.png">
+</div>
+
+---
+
+## File system page
+
+Access the file system
+
+<div align="center">
+<img src="./public/page-file-system.png">
+</div>
+
+---
+
+## Notifications page
+
+Send custom notifications at os-level
+
+<div align="center">
+<img src="./public/page-notifications.png">
+</div>
+
+---
+
+## OS info page
+
+Show system informations
+
+<div align="center">
+<img src="./public/page-os-info.png">
+</div>
+
+---
+
+## Storage page
+
+Read & write persistent key-value data
+
+<div align="center">
+<img src="./public/page-storage.png">
+</div>
+
+---
+
+## Webview page
+
+Create a secondary detached window
+
+<div align="center">
+<img src="./public/page-webview.png">
+</div>