bug 409392: Description for overlay decorations in user doc

doc/org.eclipse.cdt.doc.user/reference/cdt_u_cproj_view.htm

@@ -226,6 +226,51 @@ This view is not supported anymore. It is recommended to use the <a href="cdt_u_
   </tr>
 </table>
 
+<p>The table below lists some overlay decorations displayed in the C/C++ Projects view.</p>
+
+<table border="1" cellpadding="5" cellspacing="0" style="border-collapse: collapse" bordercolor="#DDDDDD" width="34%">
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/c_ovr.gif" width="7" height="8" alt="C overlay"></td>
+    <td style="width:81%" headers="description2">C/C++ project</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/edited_ovr.gif" width="7" height="8" alt="Edited overlay"></td>
+    <td style="width:81%" headers="description2">Edited</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/path_inherit_co.gif" width="7" height="8" alt="Inherit overlay"></td>
+    <td style="width:81%" headers="description2">Inherits</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/indexedFile.gif" width="7" height="8" alt="Indexed overlay"></td>
+    <td style="width:81%" headers="description2">Indexed</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/error_co.gif" width="7" height="8" alt="Error overlay"></td>
+    <td style="width:81%" headers="description2">Error</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/warning_co.gif" width="7" height="8" alt="Warning overlay"></td>
+    <td style="width:81%" headers="description2">Warning</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/setting_nav.gif" width="7" height="7" alt="Wrench overlay"></td>
+    <td style="width:81%" headers="description2">Wrench signifies customized build settings or include paths/macros</td>
+  </tr>
+  <tr>
+    <td style="width:19%" valign="top" headers="icon2">
+    <img src="../images/inactive_co.gif" width="16" height="16" alt="Inactive overlay"></td>
+    <td style="width:81%" headers="description2">Excluded from build / Deprecated / Inactive</td>
+  </tr>
+</table>
+
 <p><img src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21">
 <br><a href="../concepts/cdt_c_proj_file_views.htm">Project file views</a>
 </p>