Added readme

Author: mattbrailsford

README.md

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+# Umbraco Commerce Cart · [![NuGet](https://img.shields.io/nuget/v/Umbraco.Commerce.Cart.svg?style=modern&label=nuget)](https://www.nuget.org/packages/Umbraco.Commerce.Cart/) 
+
+A ready made shopping cart for Umbraco Commerce
+
+![Screenshot](assets/cart.png)
+
+## About
+
+Umbraco Commerce Cart is an add-on package for Umbraco Commerce, providing a drop-in shopping cart solution.
+
+With Umbraco Commerce Cart you can quickly and easily add a ready made, themeable and responsive shopping cart onto your site, saving hours of custom development. 
+
+This package uses the same versioning strategy with Umbraco Commerce. 
+
+## Working locally
+To fork and build your own Commerce Cart package, you will need:
+* .NET 9.0 SDK or newer
+* Umbraco 15.0.0 or newer
+* Umbraco Commerce 15.0.0 or newer
+* NodeJS 20+ for frontend development. Open `/src/Umbraco.Commerce.Cart/Client` folder and run `npm i; npm run build`
+
+## Raising an Issue
+
+If you find any issues with the Umbraco Commerce Cart add-on itself please raise them in the [issues section of this repository](https://github.com/umbraco/Umbraco.Commerce.Cart/issues)
+
+## License
+
+Copyright © 2025 Umbraco
+
+This demo store is [licensed under MIT](LICENSE.md). The core Umbraco Commerce product is licensed under Umbracos commercial license.
+