Simple adal sample

Add simple auth sample.

This simple example is just a starting point and is intended to show how
to use the adal.js methods to authenticate with Office 365 and obtain a
token that can be used in REST calls to the Office 365 API.

The sample uses a simple HTML page and about 50 lines of JavaScript
and only depends on adal.js and jQuery, avoiding dependency on a
particular SPA framework.The intention is to provide sample code for those
building apps using frameworks other than Anglular, or no framework,
or building apps for Cordova or WinJS.