added docs on how to script an uploaded file

README

@@ -160,3 +160,25 @@ Example in controller:
       render :action => :new
     end
   end
+
+attachement_fu scripting
+====================================
+
+You may wish to import a large number of images or attachments. 
+The following example shows how to upload a file from a script. 
+
+#!/usr/bin/env ./script/runner
+
+# required to use ActionController::TestUploadedFile 
+require 'action_controller'
+require 'action_controller/test_process.rb'
+
+@attachable = AttachmentMetadataModel.new(:uploaded_data => ActionController::TestUploadedFile.new(path, mimetype))
+@attachable.save
+
+This will "upload" the file at path and create the new model.
+
+mimetype is a string like "image/jpeg". One way to get the mimetype for a given file on a UNIX system
+
+mimetype = `file -ib #{path}`.gsub(/\n/,"")
+