Add main readme and icon

Author: kzu

assets/img/icon-32.png

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+![Icon](assets/img/icon-64.png) Devlooped.Extensions.AI
+============
+
+[![Version](https://img.shields.io/nuget/vpre/dotnet-openai.svg?color=royalblue)](https://www.nuget.org/packages/dotnet-openai)
+[![Downloads](https://img.shields.io/nuget/dt/dotnet-openai.svg?color=green)](https://www.nuget.org/packages/dotnet-openai)
+[![License](https://img.shields.io/github/license/devlooped/dotnet-openai.svg?color=blue)](https://github.com//devlooped/dotnet-openai/blob/main/license.txt)
+[![Build](https://github.com/devlooped/dotnet-openai/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/devlooped/dotnet-openai/actions/workflows/build.yml)
+
+Extensions for [Microsoft.Extensions.AI](https://nuget.org/packages/Microsoft.Extensions.AI).
+
+<!-- #content -->
+
+
+<!-- #content -->
+<!-- include https://github.com/devlooped/sponsors/raw/main/footer.md -->