Demo branch adding JSCAD type, without implementing the render

Related to #411

app/web/src/helpers/cadPackages/jsCadController.ts

@@ -0,0 +1,15 @@
+import { RenderArgs, DefaultKernelExport, createUnhealthyResponse } from './common'
+
+export const render: DefaultKernelExport['render'] = async ({
+  code,
+  settings,
+}: RenderArgs) => {
+  // do your magic
+  return createUnhealthyResponse( new Date(), 'JSCAD controller not implemented yet')
+}
+
+const jsCadController: DefaultKernelExport = {
+  render,
+}
+
+export default jsCadController