Adds/modifies examples for node.js and webpack.

examples/webpack/README.md

@@ -0,0 +1,18 @@
+## Overview
+
+Example to demonstrate PDF.js library usage with webpack.
+
+## Getting started
+
+Build project and install the example dependencies:
+
+  $ node make dist
+  $ cd examples/webpack
+  $ npm install
+
+To build webpack bundles, run `node_modules/.bin/webpack`.  If you are running
+a web server, you can observe the build results at
+http://localhost:8888/examples/webpack/index.html
+
+See main.js and webpack.config.js files. Please notice that PDF.js packaging
+requires 'entry' loader.