Card: how to credit Atech (CC BY 4.0)

README.md

@@ -19,6 +19,19 @@ every module in the [Atech SDK](https://pypi.org/project/atech/) catalog, the pr
 the SDK has no firmware for yet (USB-C, Power Jack, Micro-SD Card, Big Screen, Camera,
 Soil Sensor, Load Cell), and the 8-, 10- and 14-port boards.
 
+## License: free to use, credit Atech
+
+These assets are open under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/):
+use, change and redistribute them, in research, teaching and commercial products,
+as long as you **credit Atech**. In anything you publish or ship with them (a paper,
+a video, a game, a product, a modified copy), say so, for example:
+
+> 3D models: Atech SimReady assets by Atech ([atech.dev](https://atech.dev)), CC BY 4.0,
+> https://huggingface.co/datasets/atechdev/simready-assets
+
+Note if you changed them. CC BY 4.0 covers these 3-D files. It gives no rights to the
+Atech name or logo beyond that credit, and it does not suggest Atech endorses your work.
+
 ## Build with the real hardware
 
 - **Firmware and drivers: the `atech` Python library.** `pip install atech` gives you