Update readme.md

Author: null511

readme.md

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 C# .NET wrapper for Jenkins HTTP/REST API. Supports asynchronous programming model. Package available on [NuGet](https://www.nuget.org/packages/jenkinsnet).
 
+This project is now considered stable, and not actively being developed. However, if you find a bug or feature missing please file an Issue here on GitHub and I will adress it as soon as possible. Thank you for your interest!
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 Visit the [Wiki](https://github.com/null511/Jenkins.NET/wiki) for Code Examples.
 
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