docs: add readme

LICENSE

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+MIT License
+
+Copyright (c) 2023 NekoSpace & bsdayo
+
+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

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+# NekoSpace.Toolkit.HostedServices
+
+[![NuGet Version](https://img.shields.io/nuget/v/NekoSpace.Toolkit.HostedServices?label=NuGet)](https://www.nuget.org/packages/NekoSpace.Toolkit.HostedServices)
+![.NET Version](https://img.shields.io/badge/.NET-6-blue)
+[![License](https://img.shields.io/badge/License-MIT-lightblue)](./LICENSE)
+
+Utilities for building Hosted Service for .NET Generic Host (or ASP.NET Core) applications.
+
+## Features
+
+- Conveniently build scheduled services with Cron expressions with `CronScheduledService`.
+
+## License
+
+This project is under [MIT license](./LICENSE).