Added simple README

Author: Pablo Brasero

README.md

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+# Example of HTML5-powered file uploads
+
+A simple application written in Ruby, using the Sinatra framework. Hopefully it should be easy to read even to those who don't know Ruby.
+
+To run it, just do:
+
+    rackup
+
+And the application should be accessible at `http://localhost:9292`.
+
+If you want to know more, have a look at our [blog post covering HTML5 file uploads](http://blog.new-bamboo.co.uk/2010/7/30/html5-powered-ajax-file-uploads)
+
+# Rack::RawUpload
+
+This example includes and uses a piece of middleware called [Rack::RawUpload](http://github.com/newbamboo/rack-raw-upload), also by us. It makes handling this kind of uploads much easier.