Add AppVeyor badge to README.md

Sergei Vorobev · Sergei Vorobev · commit 1ea6785ef01f · 2016-11-18T14:51:00.000-08:00
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+[![Build status](https://ci.appveyor.com/api/projects/status/onshefxnc4g4pv87/branch/staging?svg=true)](https://ci.appveyor.com/project/PowerShell/powershell-docs/branch/staging)
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 # PowerShell Documentation
 
 Welcome to the PowerShell-Docs repository, housing the official Windows PowerShell documentation [available on MSDN](https://msdn.microsoft.com/powershell/dsc/overview). 

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	`1`	`+[![Build status](https://ci.appveyor.com/api/projects/status/onshefxnc4g4pv87/branch/staging?svg=true)](https://ci.appveyor.com/project/PowerShell/powershell-docs/branch/staging)`
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`1`	`3`	`# PowerShell Documentation`
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`3`	`5`	`Welcome to the PowerShell-Docs repository, housing the official Windows PowerShell documentation [available on MSDN](https://msdn.microsoft.com/powershell/dsc/overview).`