Adding build badge

Author: fabiocav

README.md

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 WebJobs.Script
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+![Build status](http://aka.ms/azfuncbuild)
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 This repo contains libraries that enable a **light-weight scripting model** for the [Azure WebJobs SDK](http://github.com/Azure/azure-webjobs-sdk). You simply provide job function **scripts** written in various languages (e.g. Javascript/[Node.js](http://nodejs.org), C#, Python, F#, PowerShell, PHP, CMD, BAT, BASH scripts, etc.) along with a simple **function.json** metadata file that indicates how those functions should be invoked, and the scripting library does the work necessary to plug those scripts into the [Azure WebJobs SDK](https://github.com/Azure/azure-webjobs-sdk) runtime.
 
 These libraries are the runtime used by [Azure Functions](https://azure.microsoft.com/en-us/services/functions/). The runtime builds upon the tried and true [Azure WebJobs SDK](https://github.com/Azure/azure-webjobs-sdk) - this library just layers on top to allow you to "**script the WebJobs SDK**". So you get the full benefits and the power of the WebJobs SDK, including the [WebJobs Dashboard](http://azure.microsoft.com/en-us/documentation/videos/azure-webjobs-dashboard-site-extension/).