docs(logo): add logo (#4)

README.md

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-# Diffract
+<br />
+
+<p align="center">
+ <img src="https://raw.githubusercontent.com/d-edge/diffract/main/diffract.png" alt="diffract logo" height="140">
+</p>
+
+<p align="center">
+  <a href="https://github.com/d-edge/diffract/actions" title="actions"><img src="https://github.com/d-edge/diffract/actions/workflows/build.yml/badge.svg?branch=main" alt="actions build" /></a>
+ <a href="https://www.nuget.org/packages/diffract/" title="nuget"><img src="https://img.shields.io/nuget/vpre/diffract" alt="version" /></a>
+ <a href="https://www.nuget.org/stats/packages/diffract?groupby=Version" title="stats"><img src="https://img.shields.io/nuget/dt/diffract" alt="download" /></a> 
+ <a href="https://raw.githubusercontent.com/d-edge/diffract/main/LICENSE" title="license"><img src="https://img.shields.io/github/license/d-edge/diffract" alt="license" /></a>
+</p>
+
+<br />
 
 Diffract is a .NET library that displays a readable diff between two objects.
 It is particularly useful for unit testing complex objects.