update Documentation list

public/why.html

@@ -146,7 +146,17 @@
 					</li>
 					<li>
 						<a href="https://gitlab.com/src_prepare/src_prepare-overlay/blob/master/README.md">
-							Portage Overlay
+							Introduction
+						</a>
+					</li>
+                    <li>
+						<a href="https://gitlab.com/src_prepare/src_prepare-overlay/-/blob/master/CONTRIBUTING.md">
+							Contributing
+						</a>
+					</li>
+                    <li>
+						<a href="https://gitlab.com/src_prepare/src_prepare-overlay/-/blob/master/TODO.md">
+							To-do
 						</a>
 					</li>
 				</ul>