add license

Author: cg-zhou

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 cg-zhou
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,6 +1,15 @@
 # StdEx
 A utility library based on .NET Standard | 一个基于 .NET Standard 的工具库
 
+## Links | 链接
+- NuGet Package: [https://www.nuget.org/packages/StdEx](https://www.nuget.org/packages/StdEx)
+- GitHub Repository: [https://github.com/cg-zhou/std-ex](https://github.com/cg-zhou/std-ex)
+
+[![NuGet](https://img.shields.io/nuget/v/StdEx.svg)](https://www.nuget.org/packages/StdEx/)
+[![NuGet Downloads](https://img.shields.io/nuget/dt/StdEx.svg)](https://www.nuget.org/packages/StdEx/)
+[![.NET Standard](https://img.shields.io/badge/.NET%20Standard-2.0-blue.svg)](https://github.com/dotnet/standard/blob/master/docs/versions.md)
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://github.com/cg-zhou/std-ex/blob/main/LICENSE)
+
 ## Utility Classes
 - JsonUtils - JSON serialization and deserialization
 - XmlUtils - XML document reading, writing and serialization