Add template usage instructions to README; resolves #12

Author: petebachant

README.md

@@ -14,3 +14,15 @@ This project can be reproduced with:
 ```sh
 calkit run
 ```
+
+## How to use this project as a template
+
+With the Calkit CLI:
+
+```sh
+calkit new project --template calkit/example-basic
+```
+
+or click "use this project as a template" at https://calkit.io/calkit/example-basic:
+
+<img width="1068" height="667" alt="Image" src="https://github.com/user-attachments/assets/8ead705e-b92f-4e66-a346-22e238012da6" />