Update README to indicate project archived status

README.md

@@ -1,3 +1,13 @@
+> [!WARNING]
+> **Project Archived**
+>
+> This project is no longer actively maintained and has been archived. No new features, bug fixes, or updates are planned.
+>
+> If you would like to fix an issue, add new functionality, or continue development, please create a fork of this repository and maintain your own version.
+>
+> Thank you to everyone who has used, contributed to, or supported this project.
+
+
 Master: [![Build Status](https://dev.azure.com/exit/xFunc/_apis/build/status/sys27.xFunc?branchName=master)](https://exit.visualstudio.com/xFunc/_build/latest?definitionId=4&branchName=master) [![codecov](https://codecov.io/gh/sys27/xFunc/branch/master/graph/badge.svg)](https://codecov.io/gh/sys27/xFunc)  
 Dev: [![Build Status](https://dev.azure.com/exit/xFunc/_apis/build/status/sys27.xFunc?branchName=dev)](https://exit.visualstudio.com/xFunc/_build/latest?definitionId=4&branchName=dev) [![codecov](https://codecov.io/gh/sys27/xFunc/branch/dev/graph/badge.svg)](https://codecov.io/gh/sys27/xFunc)  
 xFunc.Maths: [![NuGet](https://img.shields.io/nuget/v/xFunc.Maths.svg)](https://www.nuget.org/packages/xFunc.Maths) [![Downloads](https://img.shields.io/nuget/dt/xFunc.Maths.svg)](https://www.nuget.org/packages/xFunc.Maths)