add star chart

Author: Splizard

src/content/docs/index.mdx

@@ -29,6 +29,7 @@ import { Card, CardGrid } from '@astrojs/starlight/components';
 	</Card>
 	<Card title="Github Repository" icon="open-book">
 		- [Grow-Graphics GD GitHub Repo](https://github.com/grow-graphics/gd)
+		  [![Star History Chart](https://api.star-history.com/svg?repos=grow-graphics/gd&type=Date)](https://star-history.com/#grow-graphics/gd&Date)
 	</Card>
 	<Card title="Godot Game Engine" icon="add-document">
 		![Godot Game Engine](../../assets/godot-logo.svg)