Added nuget badge

Author: synercoder

README.md

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 # FileFormats.Pdf
 [![Build Status](https://synercoding.visualstudio.com/Synercoding.FileFormats.Pdf/_apis/build/status/synercoder.FileFormats.Pdf?branchName=master)](https://synercoding.visualstudio.com/Synercoding.FileFormats.Pdf/_build/latest?definitionId=7&branchName=master)
 
+[![NuGet][nuget-badge]][nuget] 
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+[nuget]: https://www.nuget.org/packages/Synercoding.FileFormats.Pdf/
+[nuget-badge]: https://img.shields.io/nuget/v/Synercoding.FileFormats.Pdf.svg?label=Synercoding.FileFormats.Pdf
+
+
 This project was created to enable PDF creation on .NETStandard. This because multiple libraries did not suit my purpose of working on .NET Core & .NET Framework the same way. Some alternatives supported settings the different boxes (Media, Crop, Bleed & Trim) but did not fully supported images on all platforms. Others supported images but not the different boxes, and again others did not work at all on .NET Core.
 
 Because of those reasons this libary was created.