Added readme and screenshot to Wood Theme.

Merged from MOODLE_15_STABLE

theme/wood/README.html

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+<h3>WOOD THEME</h3>
+<hr />
+
+<p>This theme is a really simple one using background 
+images for near every element inside Moodle.</p>
+
+<p>Two objetives were the main reason to build it:</p>
+
+<ul>
+<li>To learn how all the CSS stuff was working under Moodle 1.5 (now
+I think it's really a great and powerful stuff!).</li>
+<li>To create an image-based theme template to allow quick 
+modifications by simply changing some images and colors.</li>
+</ul>
+
+<p>This theme is based on Moodle's Standard Theme.  
+By default, the styles of the Standard theme
+are automatically loaded before any other
+themes, so that all custom themes need to do is to define their
+own styles to augment or overwrite particular standard styles.</p>
+
+<p>For Wood to work properly, the Moodle Standard theme must 
+be present and unaltered in the Theme directory.</p>
+
+<p>In this way custom themes are not "left behind" by Moodle upgrades.</p>
+
+<p>For any suggestion, fix or comment about this theme, please, start a discussion
+in the <a target="_blank" href="http://moodle.org/mod/forum/view.php?id=46">"Themes Forum"</a>.</p>
+
+<p>That's all, moodlers. Enjoy and ciao!</p>