Update README.md

remove banner image, since it doesn't play well with NuGet

Author: afrise

README.md

@@ -2,7 +2,7 @@
 [![NuGet](https://img.shields.io/nuget/v/MCPSharp)](https://www.nuget.org/packages/MCPSharp)
 [![NuGet Downloads](https://img.shields.io/nuget/dt/MCPSharp)](https://www.nuget.org/packages/MCPSharp)
 
-# ![MCPSharp Banner](https://github.com/afrise/MCPSharp/blob/master/MCPSharp/icon.png)  MCPSharp
+# MCPSharp
 
 MCPSharp is a .NET library that helps you build Model Context Protocol (MCP) servers and clients - the standardized API protocol used by AI assistants and models. With MCPSharp, you can: