docs: add socialify image to readme (#687)

Author: fgreinacher

README.md

@@ -1,10 +1,9 @@
+![System.IO.Abstractions](https://socialify.git.ci/System-IO-Abstractions/System.IO.Abstractions/image?description=1&font=Source%20Code%20Pro&forks=1&issues=1&pattern=Charlie%20Brown&pulls=1&stargazers=1&theme=Dark)
 [![NuGet](https://img.shields.io/nuget/v/System.IO.Abstractions.svg)](https://www.nuget.org/packages/System.IO.Abstractions)
 ![Continuous Integration](https://github.com/System-IO-Abstractions/System.IO.Abstractions/workflows/Continuous%20Integration/badge.svg)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/2e777fa545c94767acccd6345b1ed9b7)](https://app.codacy.com/gh/System-IO-Abstractions/System.IO.Abstractions?utm_source=github.com&utm_medium=referral&utm_content=System-IO-Abstractions/System.IO.Abstractions&utm_campaign=Badge_Grade_Dashboard)
 [![Renovate enabled](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://renovatebot.com/)
 
-> ***Just like `System.Web.Abstractions`, but for `System.IO`. Yay for testable IO access!***
-
 At the core of the library is `IFileSystem` and `FileSystem`. Instead of calling methods like `File.ReadAllText` directly, use `IFileSystem.File.ReadAllText`. We have exactly the same API, except that ours is injectable and testable.
 
 ```shell