Update README.md

Author: slluis

README.md

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+**NOTICE**
+-------------
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+**This project has not been built nor maintained since January 2020 and has been archived**
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+If you are interested in working on the project, even when archived you can still create a fork of it.
+
+<br/><br/><br/>
+
+---
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+<br/><br/><br/>
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+
 **MonoDevelop** is a full-featured integrated development environment (IDE) for mono using Gtk#.
 
 The MonoDevelop core is also the foundation for Visual Studio for Mac.
 Feel free to file bugs against Visual Studio for Mac here as well.
 
 See http://www.monodevelop.com for more info.
 
-[![Build Status](http://jenkins.mono-project.com/job/test-monodevelop-mainline/badge/icon)](http://jenkins.mono-project.com/job/test-monodevelop-mainline/)
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 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mono/monodevelop?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
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