Add comment operation example

examples/broadcast.html

@@ -8,16 +8,38 @@
 
 <script src="../dist/steem.min.js"></script>
 <script>
-steem.broadcast.vote(
-  '5JRaypasxMx1L97ZUX7YuC5Psb5EAbF821kkAGtBj7xCJFQcbLg', // Posting WIF
-  'guest123', // Voter username
-  'firepower', // Author
-  'steemit-veni-vidi-vici-steemfest-2016-together-we-made-it-happen-thank-you-steemians', // Permlink
-  10000, // Weight (10000 = 100%)
-  function(err, result) {
-    console.log(err, result);
-  }
-);
+  /** Configure your account */
+  var username = 'guest123';
+  var postingWif = '5JRaypasxMx1L97ZUX7YuC5Psb5EAbF821kkAGtBj7xCJFQcbLg';
+
+  /** Broadcast a vote */
+  steem.broadcast.vote(
+    postingWif,
+    username, // Voter
+    'firepower', // Author
+    'steemit-veni-vidi-vici-steemfest-2016-together-we-made-it-happen-thank-you-steemians', // Permlink
+    10000, // Weight (10000 = 100%)
+    function(err, result) {
+      console.log(err, result);
+    }
+  );
+
+  /** Broadcast a comment */
+  var permlink = new Date().toISOString().replace(/[^a-zA-Z0-9]+/g, '').toLowerCase();
+
+  steem.broadcast.comment(
+    postingWif,
+    'siol', // Parent Author
+    'test', // Parent Permlink
+    username, // Author
+    permlink, // Permlink
+    '', // Title
+    'This is a test!', // Body,
+    { tags: ['test'], app: `steemjs/examples` }, // Json Metadata
+    function(err, result) {
+      console.log(err, result);
+    }
+  );
 </script>
 
 </body>