Update README.md

Added links to previous versions of EF Core -- added badges.

README.md

@@ -1,4 +1,8 @@
-# Trackable Entities for Entity Framework Core
+# <img src="https://raw.githubusercontent.com/TrackableEntities/TrackableEntities.Core/develop/TrackableEntities.EF.Core/icon.png" width="32" height="32" /> Trackable Entities for Entity Framework Core
+
+[![NuGet version](https://badge.fury.io/nu/TrackableEntities.EF.Core.svg)](https://badge.fury.io/nu/TrackableEntities.EF.Core)
+[![Downloads](https://img.shields.io/nuget/dt/TrackableEntities.EF.Core.svg?logo=nuget&color=green)](https://www.nuget.org/packages/TrackableEntities.EF.Core) 
+[![Build](https://github.com/TrackableEntities/TrackableEntities.Core/actions/workflows/deploy.yml/badge.svg?branch=develop)](https://github.com/TrackableEntities/TrackableEntities.Core/actions/workflows/deploy.yml)
 
 Change-tracking across service boundaries with [ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/) Web API and [Entity Framework Core](https://docs.microsoft.com/en-us/ef/core/).
 
@@ -8,7 +12,7 @@ Change-tracking across service boundaries with [ASP.NET Core](https://docs.micro
 
 ## Installation
 
-Trackable Entities for EF Core is available as a NuGet package that can be installed in an ASP.NET Core Web API project that uses Entity Framework Core.
+Trackable Entities for EF Core 8 is available as a NuGet package that can be installed in an ASP.NET Core Web API project that uses Entity Framework Core.
 
 You can use the [Package Manager UI or Console](https://docs.microsoft.com/en-us/nuget/tools/package-manager-console) in Visual Studio to install the TE package.
 
@@ -22,6 +26,11 @@ You can also use the [.NET Core CLI](https://docs.microsoft.com/en-us/dotnet/cor
 dotnet add package TrackableEntities.EF.Core
 ```
 
+## Packages for Previous Versions of EntityFramework Core
+
+##### [EntityFramework Core v7](https://www.nuget.org/packages/TrackableEntities.EF.Core/7.0.0) | [EntityFramework Core v6](https://www.nuget.org/packages/TrackableEntities.EF.Core/6.0.0) | [EntityFramework Core v5](https://www.nuget.org/packages/TrackableEntities.EF.Core/5.0.1) | [EntityFramework Core v3](https://www.nuget.org/packages/TrackableEntities.EF.Core/3.1.1)
+
+
 ## Trackable Entities Interfaces
 
 The way Trackable Entities allows change-tracking across service boundaries is by adding a `TrackingState` property to each entity. `TrackingState` is a simple enum with values for `Unchanged`, `Added`, `Modified` and `Deleted`.  The TE library will traverse objects graphs to read this property and inform EF Core of each entity state, so that you can save all the changes at once, wrapping them in a single transaction that will roll back if any individual update fails.