List available drivers and platform in top-level README

Signed-off-by: Alex Coles <alex@alexcolesportfolio.com>

README.markdown

@@ -4,6 +4,50 @@ DataObjects README
 DataObjects.rb is an attempt to rewrite existing Ruby database drivers to
 conform to one, standard interface.
 
+At present the following drivers are available:
+
+<table>
+  <tr>
+    <th>Database Vendor</th>
+    <th>MRI (1.8.6/7) / 1.9</th>
+    <th>JRuby</th>
+  </tr>
+  <tr>
+    <td>MySQL</td>
+    <td>x</td>
+    <td>x</td></tr>
+  <tr>
+    <td>Oracle</td>
+    <td>x</td>
+    <td>x</td></tr>
+  <tr>
+    <td>PostgreSQL</td>
+    <td>x</td>
+    <td>x</td></tr>
+  <tr>
+    <td>SQLite3</td>
+    <td>x</td>
+    <td>x</td></tr>
+  <tr>
+    <td>Derby</td>
+    <td>-</td>
+    <td>x</td></tr>
+  <tr>
+    <td>H2</td>
+    <td>-</td>
+    <td>x</td></tr>
+  <tr>
+    <td>HSQLDB</td>
+    <td>-</td>
+    <td>x</td></tr>
+  <tr>
+    <td>SQL Server</td>
+    <td><em>pending</em></td>
+    <td><em>pending</em></td></tr>
+</table>
+
+There is experimental support for [Rubinius][rubinius].
+
 At present, PostgreSQL, MySQL and SQLite drivers are available. More drivers are
 currently under development. If you feel like living on the edge, install and
 test drivers directly from this repository.
@@ -12,9 +56,10 @@ Introduction
 ------------
 
 To connect to and query the database, DataObjects relies on native extensions.
-Native extensions have been written in both C (for the MRI/Ruby 1.8.6 platform)
-and Java (for the JRuby platform). Individual drivers may include extensions for
-both Ruby MRI and JRuby, or one or the other.
+Native extensions have been written in both C (for Ruby 1.8.6/7 (MRI), Ruby
+1.9.x (YARV) and Rubinius platform) and Java (for the JRuby platform).
+Individual drivers may include extensions for both Ruby MRI and JRuby, or one
+or the other.
 
 C extensions have been written using according to each vendor API. Java drivers
 use the standard JDBC API. Although there are dialectical differences between
@@ -31,7 +76,9 @@ the provided `rake install` task to install for the default platform.
 Copyright and Licensing
 -----------------------
 
-Please see the copyright notices in each individual driver README or LICENSE
-file. Java-based drivers bundle JDBC driver JAR files, which may be provided
-under a license that is more restrictive than the MIT License used by the
+Please see the copyright notices in each individual driver README.markdown or
+LICENSE file. Java-based drivers bundle JDBC driver JAR files, which may be
+provided under a license that is more restrictive than the MIT License used by the
 data\_objects gem itself.
+
+[rubinius]:http://rubini.us/