converted imagesize plugin to lib

lib/imagesize/README.txt

@@ -0,0 +1,49 @@
+= image_size -- measure image size(GIF, PNG, JPEG ,,, etc)
+
+measure image (GIF, PNG, JPEG ,,, etc) size code by Pure Ruby
+["PSD", "XPM", "TIFF", "XBM", "PGM", "PBM", "PPM", "BMP", "JPEG", "PNG", "GIF", "SWF"]
+
+== Download
+
+The latest version of image_size can be found at
+
+* http://rubyforge.org/frs/?group_id=3460
+
+== Installation
+
+=== Normal Installation
+
+You can install image_size with the following command.
+
+  % ruby setup.rb
+
+from its distribution directory.
+
+=== GEM Installation
+
+Download and install  image_size with the following.
+
+   gem install imagesize
+
+== image_size References
+
+* image_size Project Page: http://rubyforge.org/projects/imagesize
+* image_size API Documents: http://imagesize.rubyforge.org
+
+== Simple Example
+
+  ruby "rubygems" # you use rubygems
+  ruby "image_size"
+  ruby "open-uri"
+  open("http://www.rubycgi.org/image/ruby_gtk_book_title.jpg", "rb") do |fh|
+    p ImageSize.new(fh.read).get_size
+  end
+
+== Licence
+
+This code is free to use under the terms of the Ruby's licence. 
+
+== Contact
+
+Comments are welcome. Send an email to "Keisuke Minami":mailto:keisuke@rccn.com
+