Added AppVeyor build status

arbitrarybytes · web-flow · commit 2be066760a61 · 2020-08-09T23:41:51.000+05:30
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 # Arbitrary Extensions
 
 A .NET Standard 2.0 library consisting of a ton of very useful C# extension methods.
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+[![Build status](https://ci.appveyor.com/api/projects/status/5i2gmikvtr3fiyw9/branch/master?svg=true)](https://ci.appveyor.com/project/arbitrarybytes/arbitrary-extensions/branch/master)
