chore(demos): added svelte default demo

demos/setup/svelte.ts

@@ -0,0 +1,21 @@
+import 'iframe-resizer/js/iframeResizer.contentWindow'
+import './style.scss'
+
+import { debug, splitName } from './helper'
+
+export default function init(name: string, source: any) {
+  // @ts-ignore
+  window.source = source
+  document.title = name
+
+  const [demoCategory, demoName] = splitName(name)
+
+  import(`../src/${demoCategory}/${demoName}/Svelte/index.svelte`)
+    .then(Module => {
+      const Component = Module.default
+
+      new Component({ target: document.querySelector('#app') }) // eslint-disable-line
+
+      debug()
+    })
+}