added firebase sample

Samples/firebase.js

@@ -0,0 +1,39 @@
+//
+// # Firebase Sample
+//
+// A simple sample of writing data to Firebase with Nodejs.
+//
+// Make sure to install the Firebase module with:
+//
+//     npm install firebase
+//
+// You can run this sample with:
+//
+//     node firebase.js
+//
+var Firebase = require('firebase');
+
+var id = Math.floor(Math.random()*1000000)
+  , addy = "https://"+ id +".firebaseio-demo.com";
+
+console.log("You can view your data being written to: "+ addy);
+console.log("Data will continue to be written until you close this program.");
+
+// Create a Firebase Reference
+var firebaseRef = new Firebase(addy);
+
+// This function is called from setInterval, every 5 seconds
+function dataToFirebase() {
+  var key = ""+Math.floor(Math.random()*10000)
+    , val = "This is random data, from firebase.js"
+    , obj = {};
+  obj[key] = val;
+  // Push our random data to firebase
+  firebaseRef.push(obj);
+}
+setInterval(dataToFirebase, 5000);
+
+// Listen for data being added to firebase.
+firebaseRef.on("child_added", function(snapshot) {
+  console.log("Value from Firebase: ", snapshot.val());
+});