mono: add licensing details

pkgs/development/compilers/mono/generic.nix

@@ -81,6 +81,15 @@ stdenv.mkDerivation rec {
     description = "Cross platform, open source .NET development framework";
     platforms = with platforms; darwin ++ linux;
     maintainers = with maintainers; [ thoughtpolice obadz vrthra ];
-    license = licenses.free; # Combination of LGPL/X11/GPL ?
+    license = with licenses; [
+      /* runtime, compilers, tools and most class libraries licensed */ mit
+      /* runtime includes some code licensed */ bsd3
+      /* mcs/class/I18N/mklist.sh marked GPLv2 and others just GPL */ gpl2Only
+      /* RabbitMQ.Client class libraries dual licensed */ mpl20 asl20
+      /* mcs/class/System.Core/System/TimeZoneInfo.Android.cs */ asl20
+      /* some documentation */ mspl
+      # https://www.mono-project.com/docs/faq/licensing/
+      # https://github.com/mono/mono/blob/main/LICENSE
+    ];
   };
 }