add example usage for cryptget.js

www/read/main.js

@@ -0,0 +1,23 @@
+define([
+    '/common/cryptget.js',
+    '/bower_components/jquery/dist/jquery.min.js',
+], function (Crypt) {
+    var $ = window.jQuery;
+
+    var $target = $('#target');
+    var $dest = $('#dest');
+
+    var useDoc = function (err, doc) {
+        if (err) { return console.error(err); }
+        console.log(doc);
+        $dest.text(doc);
+    };
+
+    $('#get').click(function () {
+        var val = $target.val();
+        if (!val.trim()) { return; }
+        Crypt.get(val, useDoc);
+    });
+
+    if (window.location.hash) { Crypt.get(void 0, useDoc); }
+});