Move linux instructions to contributing.md

CONTRIBUTING.md

@@ -20,7 +20,7 @@ The main GitHub repository is at [https://github.com/nhibernate/nhibernate-core]
 
 ## The Build Menu
 
-**ShowBuildMenu.bat** will be your friend throughout this journey. He's easiest to work with if you make his box bigger by following these steps: 
+**ShowBuildMenu.bat** will be your friend throughout this journey. A .sh version exists for Linux. He's easiest to work with if you make his box bigger by following these steps: 
 
 1.  Run ShowBuildMenu.bat.
 2.  Right click on the title bar of the window.
@@ -41,6 +41,8 @@ The main GitHub repository is at [https://github.com/nhibernate/nhibernate-core]
 4.  (Optional) Run all the tests with option D and hopefully you will see no failing tests. The build may fail on certain databases; please ask on the mailing list if you are having trouble.
 5.  Before using the database for unit tests from Visual Studio, you'll need to create an empty database that matches your connection string.
 
+Compiling the solution under Linux requires installation of [Mono](https://www.mono-project.com/download/stable) and of the [.NET Core SDK](https://www.microsoft.com/net/download).
+
 ## Creating a Test Case to Verify the Issue
 
 In most cases, you will be adding your test to the NHibernate.Test project. If there is a test that only works with VisualBasic, then add it to the NHibernate.Test.VisualBasic project instead. 

README.md

@@ -33,12 +33,6 @@ There are two official NHibernate community forums:
 [B1]: http://groups.google.com/group/nhusers
 [B2]: http://groups.google.com/group/nhibernate-development
 
-Linux Debug
------------
-
-If you want to debug NHibernate on Linux, I need install [mono](https://www.mono-project.com/download/stable/)
-
-
 Bug Reports
 -----------