bring back jsfiddle (#2198)

demo/fiddle/README.md

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+This folder is here to allow JSFiddle to be automatically created using this repo.
+
+You can [view the JSFiddle here](https://jsfiddle.net/gh/get/library/pure/onfido/onfido-sdk-ui/tree/master/demo/fiddle/).

demo/fiddle/demo.details

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+---
+ name: Onfido SDK Demo
+ authors:
+   - Onfido Team
+ resources:
+   - https://sdk.onfido.com/v14/Onfido.iife.js
+...

demo/fiddle/demo.js

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+const getToken = async () => {
+  const response = await fetch('https://token-factory.onfido.com/sdk_token');
+  if (!response.ok) {
+    throw new Error('Failed to get sdk token');
+  }
+
+  return (await response.json()).message;
+}
+
+async function bootstrapSdk() {
+
+  Onfido.init({
+    useModal: false,
+    token: await getToken(),
+    onComplete: (data) => {
+      console.log('completed', data);
+    },
+    onError: console.error,
+    steps: ['welcome', 'document', 'face', 'complete'],
+  });
+}
+
+bootstrapSdk().catch(console.error);