[skip ci] Update readme

Author: dotps1

README.md

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 # PSAppVeyor
 ### A PowerShell Module providing functions to interact with the [AppVeyor](www.appveyor.com) REST API.
 
+[![Build status](https://ci.appveyor.com/api/projects/status/83nuaecxyn7rr16q?svg=true)](https://ci.appveyor.com/project/dotps1/psappveyor)
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 This module is still very beta, in fact, we will just call it alpha.
 
 To get started after you install/import it, you need to use the `Set-AppVeyorApiToken` cmdlet.  You can get the reqired value from your [AppVeyor Account](https://ci.appveyor.com/api-token).