Added RDoc README for GitHub

Author: nbibler

README.rdoc

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+= rubyzip
+
+rubyzip is a ruby library for reading and writing zip files.
+
+= Install
+
+If you have rubygems you can install rubyzip directly from the gem
+repository
+
+  gem install rubyzip
+
+Otherwise obtain the source (see below) and run
+
+  ruby install.rb
+
+To run the unit tests you need to have test::unit installed
+
+  rake test
+
+
+= Documentation
+
+There is more than one way to access or create a zip archive with
+rubyzip. The basic API is modeled after the classes in
+java.util.zip from the Java SDK. This means there are classes such
+as Zip::ZipInputStream, Zip::ZipOutputStream and
+Zip::ZipFile. Zip::ZipInputStream provides a basic interface for
+iterating through the entries in a zip archive and reading from the
+entries in the same way as from a regular File or IO
+object. ZipOutputStream is the corresponding basic output
+facility. Zip::ZipFile provides a mean for accessing the archives
+central directory and provides means for accessing any entry without
+having to iterate through the archive. Unlike Java's
+java.util.zip.ZipFile rubyzip's Zip::ZipFile is mutable, which means
+it can be used to change zip files as well.
+
+Another way to access a zip archive with rubyzip is to use rubyzip's
+Zip::ZipFileSystem API. Using this API files can be read from and
+written to the archive in much the same manner as ruby's builtin
+classes allows files to be read from and written to the file system.
+
+rubyzip also features the
+zip/ziprequire.rb[link:files/lib/zip/ziprequire_rb.html] module which
+allows ruby to load ruby modules from zip archives.
+
+For details about the specific behaviour of classes and methods refer
+to the test suite. Finally you can generate the rdoc documentation or
+visit http://rubyzip.sourceforge.net.
+
+= License
+
+rubyzip is distributed under the same license as ruby. See
+http://www.ruby-lang.org/en/LICENSE.txt
+
+
+= Website and Project Home
+
+http://rubyzip.sourceforge.net
+
+http://sourceforge.net/projects/rubyzip
+
+== Download (tarballs and gems)
+
+http://sourceforge.net/project/showfiles.php?group_id=43107&package_id=35377
+
+= Authors
+
+Thomas Sondergaard (thomas at sondergaard.cc)
+
+Technorama Ltd. (oss-ruby-zip at technorama.net)
+
+extra-field support contributed by Tatsuki Sugiura (sugi at nemui.org)