Help: Add skinning tutorial

Based on original Classic Shell tutorial:
http://www.classicshell.net/tutorials/skintutorial.html

Author: vodek3

Src/Localization/English/OpenShellTOC.hhc

@@ -40,7 +40,14 @@
 		<LI> <OBJECT type="text/sitemap">
 			<param name="Name" value="More About Skins">
 			<param name="Local" value="StartMenu.html#skins">
-			</OBJECT>
+			<param name="ImageNumber" value="1">
+			</OBJECT>
+			<UL>
+				<LI> <OBJECT type="text/sitemap">
+				<param name="Name" value="Start Menu Skinning Tutorial">
+				<param name="Local" value="SkinTutorial.html#skin_tutorial">
+				</OBJECT>
+			</UL>
 		<LI> <OBJECT type="text/sitemap">
 			<param name="Name" value="Search">
 			<param name="Local" value="StartMenu.html#search">

Src/Localization/English/SkinTutorial.html

@@ -263,7 +263,7 @@ <h1><a name="skins"></a>Skins</h1>
 You can create your own skin. You will need an image editor that
 supports alpha channel (like Gimp or Photoshop) and a tool to edit
 resource files (like Resource Hacker or Visual Studio). And of course
-some talent for graphical design :). Read the <a target="_blank" href="http://www.classicshell.net/tutorials/skintutorial.html">Skinning Tutorial</a> before you begin.<br>
+some talent for graphical design :). Read the <a href="SkinTutorial.html">Skinning Tutorial</a> before you begin.<br>
 <br>
 <br><br>
 <h1><a name="search"></a>Search</h1><img src="images/search1.png" style="width: 302px;" alt=""><br>