Make the README file use Markdown instead of rdoc syntax. Change its extension accordingly.

README.markdown

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+Prototype
+=========
+
+#### An object-oriented JavaScript framework ####
+
+Prototype is a JavaScript framework that aims to ease development of dynamic 
+web applications.  It offers a familiar class-style OO framework, extensive
+Ajax support, higher-order programming constructs, and easy DOM manipulation.
+
+### Targeted platforms ###
+
+Prototype currently targets the following platforms:
+
+* Microsoft Internet Explorer for Windows, version 6.0 and higher
+* Mozilla Firefox 1.5 and higher
+* Apple Safari 2.0.4 and higher
+* Opera 9.25 and higher
+* Chrome 1.0 and higher
+
+Using Prototype
+---------------
+
+To use Prototype in your application, download the latest release from the 
+Prototype web site (<http://prototypejs.org/download>) and copy 
+`dist/prototype.js` to a suitable location. Then include it in your HTML
+like so:
+
+    <script type="text/javascript" src="/path/to/prototype.js"></script>
+
+### Building Prototype from source ###
+
+`prototype.js` is a composite file generated from many source files in 
+the `src/` directory. To build Prototype, you'll need:
+
+* a copy of the Prototype source tree, either from a distribution tarball or
+  from the Git repository (see below)
+* Ruby 1.8.2 or higher (<http://www.ruby-lang.org/>)
+* Rake -- Ruby Make (<http://rake.rubyforge.org/>)
+* RDoc, if your Ruby distribution does not include it
+
+From the root Prototype directory,
+
+* `rake dist` will preprocess the Prototype source using Sprockets and 
+  generate the composite `dist/prototype.js`.
+* `rake package` will create a distribution tarball in the 
+  `pkg/` directory.
+
+Contributing to Prototype
+-------------------------
+
+Check out the Prototype source with 
+
+    $ git clone git://github.com/sstephenson/prototype.git
+    $ cd prototype
+    $ git submodule init
+    $ git submodule update vendor/sprockets vendor/pdoc vendor/unittest_js
+
+Find out how to contribute: <http://prototypejs.org/contribute>.
+
+Documentation
+-------------
+
+Please see the online Prototype API: <http://prototypejs.org/api>.

README.rdoc

@@ -1,60 +0,0 @@
-= Prototype
-==== An object-oriented JavaScript framework
-
-Prototype is a JavaScript framework that aims to ease development of dynamic 
-web applications.  It offers a familiar class-style OO framework, extensive
-Ajax support, higher-order programming constructs, and easy DOM manipulation.
-
-=== Targeted platforms
-
-Prototype currently targets the following platforms:
-
-* Microsoft Internet Explorer for Windows, version 6.0 and higher
-* Mozilla Firefox 1.5 and higher
-* Apple Safari 2.0.4 and higher
-* Opera 9.25 and higher
-* Chrome 1.0 and higher
-
-== Using Prototype
-
-To use Prototype in your application, download the latest release from the 
-Prototype web site (http://prototypejs.org/download) and copy 
-<tt>dist/prototype.js</tt> to a suitable location. Then include it in your HTML
-like so:
-
-  <script type="text/javascript" src="/path/to/prototype.js"></script>
-
-=== Building Prototype from source
-
-<tt>prototype.js</tt> is a composite file generated from many source files in 
-the <tt>src/</tt> directory. To build Prototype, you'll need:
-
-* a copy of the Prototype source tree, either from a distribution tarball or
-  from the Git repository (see below)
-* Ruby 1.8.2 or higher (http://www.ruby-lang.org/)
-* Rake -- Ruby Make (http://rake.rubyforge.org/)
-* RDoc, if your Ruby distribution does not include it
-
-From the root Prototype directory,
-
-* <tt>rake dist</tt> will preprocess the Prototype source using ERB and 
-  generate the composite <tt>dist/prototype.js</tt>.
-* <tt>rake package</tt> will create a distribution tarball in the 
-  <tt>pkg/</tt> directory.
-
-== Contributing to Prototype
-
-Check out the Prototype source with 
-  $ git clone git://github.com/sstephenson/prototype.git
-  $ cd prototype
-  $ git submodule init
-  $ git submodule update
-
-Find out how to contribute:
-  http://prototypejs.org/contribute
-
-== Documentation
-
-Please see the online Prototype API:
-  http://prototypejs.org/api
-