Added a simple "hello, world" example app

Author: JamesMessinger

examples/hello-world/README.md

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+Simple "hello, world" example
+------------------------------------
+
+This example demonstrates the simplest usage of coverage-istanbul-loader.  The [`webpack.config.js` file](webpack.config.js) simply uses the the loader with its default options to produce an [output bundle](dist/main.js) that contains code coverage instrumentation.
+
+
+
+### Structure
+
+|Folder/File                              |Description
+|:----------------------------------------|:----------------------------------------------------
+|[webpack.config.js](webpack.config.js)   |The webpack config file.  It simply uses the "coverage-istanbul-loader" with its default options
+|[src folder](src)                        |The original source code, which is a simple two-file "hello, world" library.
+|[dist/main.js](dist/main.js)             |The bundled webpack output. It's intentionally _not_ minified to make it easier to see what's going on.
+|[dist/main.js.map](dist/main.js.map)     |The output sourcemap. It maps the bundled code back to the original source code files.