add screenshot to readme

README.md

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 # Dice-Box
-High performance 3D dice roller made with [BabylonJS](https://www.babylonjs.com/), [AmmoJS](https://github.com/kripken/ammo.js/) and implemented with [web workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) and [offscreenCanvas](https://doc.babylonjs.com/divingDeeper/scene/offscreenCanvas).
+High performance 3D dice roller module made with [BabylonJS](https://www.babylonjs.com/), [AmmoJS](https://github.com/kripken/ammo.js/) and implemented with [web workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) and [offscreenCanvas](https://doc.babylonjs.com/divingDeeper/scene/offscreenCanvas). Designed to be easy to integrate into your own JavaScript app.
+
+[Demo Screenshot](https://github.com/3d-dice/dice-box/blob/main/dice-screenshot.jpg)
 
 ## Demo
 New demo for version 0.5! <br>