Update ReadMe.md with info about new repository (#4936)

* Update ReadMe.md with info about new repository

* Clarify original vNext section to go with new update

ReadMe.md

@@ -1,5 +1,17 @@
 
-# 🧰 Windows Community Toolkit
+# ✨ New Repository ✨
+
+❗ We moved development to [a new repository, 'Windows'](https://aka.ms/toolkit/windows). It contains the new infrastructure and codebase for the 8.0+ versions of the Windows Community Toolkit that contains a single-codebase for [UWP/WinUI2](https://aka.ms/winui2), [WindowsAppSDK/WinUI3](https://aka.ms/winui3), and [Uno Platform](https://platform.uno) compatible components. _Please visit it for the latest information._
+
+📝 You can find out more about this latest release [on our blog post here](https://devblogs.microsoft.com/ifdef-windows/announcing-windows-community-toolkit-v8-0/). The Sample Gallery has also been [updated in the Microsoft Store](https://aka.ms/windowstoolkitapp).
+
+🧪 For new feature discussion and development, see [Windows Community Toolkit Labs](https://aka.ms/toolkit/labs/windows)
+
+🐞 For new issues, please try and reproduce on the latest packages, and then open a discussion or issue in the [new repository](https://aka.ms/toolkit/windows).
+
+📼 This repo contains the prior 7.x UWP-only based code for the Windows Community Toolkit's prior releases; the Windows App SDK compatible code is in the [`winui` branch](https://github.com/CommunityToolkit/WindowsCommunityToolkit/tree/winui). Much of this code has been merged and ported to the single-codebase version in the new repository; however, this repo will be archived for history and reference to enable migrating other components or issues, if needed.
+
+## 🧰 Windows Community Toolkit 7.x
 
 The Windows Community Toolkit is a collection of helper functions, custom controls, and app services. It simplifies and demonstrates common developer patterns when building experiences for Windows 10 and Windows 11. It contains components and helpers for both UWP and WinUI 3/WinAppSDK applications. Find out more about our support for [WinUI 3 here](https://aka.ms/wct-winui3).
 
@@ -11,11 +23,11 @@ The Windows Community Toolkit is a collection of helper functions, custom contro
 | Production (WinAppSDK/WinUI 3) | rel/winui/7.1.2 | [![Build Status](https://dev.azure.com/dotnet/CommunityToolkit/_apis/build/status/Toolkit-CI?branchName=rel/winui/7.1.2)](https://dev.azure.com/dotnet/CommunityToolkit/_build/latest?definitionId=10&branchName=rel/winui/7.1.2) | [![NuGet](https://img.shields.io/nuget/v/CommunityToolkit.WinUI.svg)](https://www.nuget.org/packages?q=CommunityToolkit.WinUI) |
 | Previews | main | [![Build Status](https://dev.azure.com/dotnet/CommunityToolkit/_apis/build/status/Toolkit-CI?branchName=main)](https://dev.azure.com/dotnet/CommunityToolkit/_build/latest?definitionId=10) | [![DevOps](https://vsrm.dev.azure.com/dotnet/_apis/public/Release/badge/696bc9fd-f160-4e97-a1bd-7cbbb3b58f66/1/1)](https://dev.azure.com/dotnet/CommunityToolkit/_packaging?_a=feed&feed=CommunityToolkit-MainLatest) |
 
-## 📢 WCT vNext Preview
+## 📢 Windows Community Toolkit v8
 
-The toolkit is being migrated to new infrastructure in [this repository](https://github.com/CommunityToolkit/Windows).
+The toolkit has been migrated to new infrastructure in [this repository](https://github.com/CommunityToolkit/Windows).
 
-[Read the blog post](https://devblogs.microsoft.com/ifdef-windows/the-windows-community-toolkit-2023-update/)
+[Read the original blog post that explained this here](https://devblogs.microsoft.com/ifdef-windows/the-windows-community-toolkit-2023-update/), **but see latest information at the top of this file**.
 
 ## 🧪 Windows Community Toolkit Labs 💻
 Labs makes it easy to contribute to the Windows Community Toolkit, try out new features still in development, and collaborate with others.