doc: explain about storybook, element generator

Author: urish

README.md

@@ -6,3 +6,37 @@ Web Components for Arduino and various electronic parts.
 
 Check out [the component catalog](https://elements.wokwi.com).
 
+## Local development
+
+To prepare for local development, clone this repo, and then install
+the dependencies:
+
+```
+npm install
+```
+
+Then start storybook:
+
+```
+npm run storybook
+```
+
+This will open a local dev server at http://localhost:6006, where you 
+can interact with the elements and see your changes live, similar to
+[https://elements.wokwi.com].
+
+## Creating a new element
+
+The easiest way to create a new element is to run the generator:
+
+```
+npm run new-element --name my-element
+```
+
+This will generate a new element called `my-element`. It will also
+create a storybook file, so you will be able to see the new element
+in storybook (see the "Local development" section above).
+
+## License
+
+Wokwi Elements are released under the [MIT license](LICENSE).