Added Nancy to README.md

README.md

@@ -63,6 +63,10 @@ There are many projects under the stewardship of the .NET Foundation. The [full
 
 - [System.Drawing](https://github.com/mono/mono/tree/master/mcs/class/System.Drawing)
 
+**Nancy**
+
+- [Nancy](https://github.com/NancyFx)
+
 **Orchard**
 
 - [Orchard CMS](https://github.com/OrchardCMS/Orchard)