Added a mainframe.rb in core/payload

Base module for payloads to be developed on the mainframe / SystemZ
(z/os mvs) architecture

lib/msf/core/payload/mainframe.rb

@@ -0,0 +1,33 @@
+# -*- coding: binary -*-
+require 'msf/core'
+
+###
+#
+# This class is here to implement advanced features for mainframe based
+# payloads. Mainframe payloads are expected to include this module if
+# they want to support these features.
+#
+###
+module Msf::Payload::Mainframe
+
+  #
+  # Z notes
+  # Z notes
+  #
+  def initialize(info = {})
+    ret = super(info)
+  end
+
+  #
+  # Returns a list of compatible encoders based on mainframe architecture
+  # most will not work because of the different architecture
+  # an XOR-based encoder will be defined soon
+  #
+  def compatible_encoders
+    encoders = super()
+    encoders2 = ['/generic\/none/','none']
+
+    return encoders2
+  end
+
+end