create vm file to require vm parts

lib/register.rb

@@ -7,7 +7,7 @@ end
 
 require "register/padding"
 require "register/positioned"
-require "vm/method_compiler"
+require "vm"
 
 require "vm/parfait"
 require "register/machine"

lib/vm.rb

@@ -0,0 +1,12 @@
+# The Vm Module expresses a medium level virtual machine.
+# It is the level between the higher ruby abstraction and the lower risc level.
+#
+# Historically it has grown out of a language abtraction that was not unlike c,
+# in that it has tyes and everything is known at compile time.
+# No method dispatch, just calling.
+# In some ways it is more like c++ as it knows about classes and in fact everything is an
+# object. 
+module Vm
+end
+require_relative "vm/tree"
+require_relative "vm/method_compiler"

lib/vm/method_compiler.rb

@@ -1,4 +1,3 @@
-require_relative "tree"
 require_relative "method_compiler/assignment"
 require_relative "method_compiler/basic_values"
 require_relative "method_compiler/call_site"