Center README title

Updated README to use div for image alignment and added description.

Author: p1va

README.md

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   <img src="art/dotnet-document.png"/>
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 # dotnet-document
 
 ![Build](https://github.com/p1va/dotnet-document/workflows/Build/badge.svg)
 [![NuGet](https://img.shields.io/nuget/v/dotnet-document.svg)](https://www.nuget.org/packages/dotnet-document) 
 [![NuGet](https://img.shields.io/nuget/dt/dotnet-document.svg)](https://www.nuget.org/packages/dotnet-document)
 
+</div>
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 A cross platform tool that auto generates an XML doc starting point for your C# codebase.