Add test code

examples/localforage/file-blob.bat

@@ -0,0 +1,5 @@
+@echo off
+set main=./examples/localforage/file-blob.js
+cd ..
+cd ..
+npm run watch

examples/localforage/file-blob.js

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+import localforage from 'localforage';
+
+localforage.getItem('photo').then(function (image) {
+    if (!image) {
+        return;
+    }
+
+    console.log('Load from localforage', image)
+})
+
+var req = new XMLHttpRequest();
+req.addEventListener('readystatechange', function () {
+    if (req.readyState === 4) { // readyState DONE
+        localforage.setItem('photo', req.response).then(function (image) {
+            console.log('Load from request', image)
+
+            // This will be a valid blob URI for an <img> tag.
+            // var blob = new Blob([image]);
+            // var imageURI = window.URL.createObjectURL(blob);
+
+        }).catch(function (err) {
+            // This code runs if there were any errors
+            console.log(err);
+        });
+    }
+});
+req.open('GET', 'assets/images/mushroom.png');
+req.responseType = 'arraybuffer';
+req.send();
+
+