introduce platform to abstract cpu and load address

lib/arm/arm_platform.rb

@@ -0,0 +1,14 @@
+require_relative "translator"
+module Arm
+  class ArmPlatform
+    def translator
+      Translator.new
+    end
+    def loaded_at
+      0x10054
+    end
+    def padding
+      0x11000 - loaded_at
+    end
+  end
+end