chore(doc): Add NuGet badge to README.md

Author: rlabbeptc

Kepware.Api/README.md

@@ -1,6 +1,7 @@
 # Kepware.Api
 
 [![Build Status](https://github.com/PTCInc/Kepware-ConfigAPI-SDK-dotnet/actions/workflows/dotnet.yml/badge.svg)](https://github.com/PTCInc/Kepware-ConfigAPI-SDK-dotnet/actions)
+[![NuGet](https://img.shields.io/nuget/v/Kepware.Api.svg)](https://www.nuget.org/packages/Kepware.Api/)
 
 ## Overview
 The `Kepware.Api` library provides a robust client implementation to interact with the Kepware Configuration API. It supports managing channels, devices, tags, and other configurations programmatically while ensuring secure and efficient communication.