Adding README file and fixing minor errors in the steps.

polymer-build-mobile/README

@@ -0,0 +1,22 @@
+This is a sample code for the Google IO 2014 codelab 
+"Polymer: Build a Material Design Mobile Web App with Paper Elements".
+
+Codelab instructions: http://io2014codelabs.appspot.com/static/codelabs/polymer-build-mobile/
+
+***
+This code sample uses [Bower](http://bower.io/) to manage code dependencies. Plese run 
+
+    $ bower install
+
+in each directory you wish to test before running the sample in the browser.
+***
+
+***
+Polymer requires files to be served over HTTP server rather than as local files. 
+E.g. if you have python (2.x) installed, run
+
+    $ python -m SimpleHTTPServer
+
+(or another server of your choice) to view the sample in the browser.
+*** 
+

polymer-build-mobile/end/codelab-app.html

@@ -62,9 +62,10 @@
           <template repeat="{{data}}" >
             <div center horizontal layout class="item" data-done="{{done}}">
               <paper-checkbox checked="{{done}}" on-change="{{dataChanged}}"></paper-checkbox>
-              <div flex class="card paper-shadow-top-z-2">
+              <div flex class="card">
                 <p>{{body}}</p>
                 <paper-ripple class="fit recenteringTouch"></paper-ripple>
+                <paper-shadow z="2"></paper-shadow>
               </div>
             </div>
           </template>
@@ -73,7 +74,6 @@
 
   </core-drawer-panel>
   <core-localstorage id="storage" name="codelab-app-storage" value="{{data}}"></core-localstorage>
-  <paper-shadow></paper-shadow>
 </template>
 <script>
   Polymer('codelab-app', {

polymer-build-mobile/step3/codelab-app.html

@@ -1,5 +1,5 @@
 <link rel="import" href="bower_components/polymer/polymer.html">
-<link rel="import" href="bower_components/font-roboto2/roboto2.html">
+<link rel="import" href="bower_components/font-roboto/roboto.html">
 <link rel="import" href="bower_components/core-drawer-panel/core-drawer-panel.html">
   <link rel="import" href="bower_components/core-header-panel/core-header-panel.html">
   <link rel="import" href="bower_components/core-toolbar/core-toolbar.html">