Move JSfiddle snippets to git

jsfiddle provides a way to create snippets from Github via a URL. This
way we can still provide easy demos, but get all the nice things from
having them in Git

Closes #32

examples/save-to-disk/jsfiddle/demo.js

@@ -0,0 +1,31 @@
+/* eslint-env browser */
+
+let pc = new RTCPeerConnection()
+var log = msg => {
+  document.getElementById('logs').innerHTML += msg + '<br>'
+}
+
+navigator.mediaDevices.getUserMedia({video: true, audio: true})
+  .then(stream => pc.addStream(document.getElementById('video1').srcObject = stream))
+  .catch(log)
+
+pc.oniceconnectionstatechange = e => log(pc.iceConnectionState)
+
+pc.onnegotiationneeded = e =>
+  pc.createOffer().then(d => {
+    document.getElementById('localSessionDescription').value = btoa(d.sdp)
+    return pc.setLocalDescription(d)
+  }).catch(log)
+
+window.startSession = () => {
+  let sd = document.getElementById('remoteSessionDescription').value
+  if (sd === '') {
+    return alert('Session Description must not be empty')
+  }
+
+  try {
+    pc.setRemoteDescription(new RTCSessionDescription({type: 'answer', sdp: atob(sd)}))
+  } catch (e) {
+    alert(e)
+  }
+}