Add stub for community project inventory

Author: graeme-a-stewart

_includes/navbar.ext

@@ -31,6 +31,7 @@
                   <li><a href="/technical_notes.html">Technical Notes</a></li>
                   <li><a href="/organization/minutes.html">Meeting Notes</a></li>
                   <li class="divider"></li>
+                  <li><a href="/inventory/inventory.html">HSF Project Inventory</a></li>
                   <li><a href="http://www.hepsoftware.org">HEP S&amp;C Knowledge Base</a></li>
                 </ul>
             </li>

inventory/inventory.md

@@ -0,0 +1,15 @@
+---
+title: "Community Project Inventory"
+layout: default
+---
+
+# Community Projects
+
+The HSF is currently compiling an inventory of community software projects.
+
+For the moment we continue to gather information on projects as part of
+the [HEP Software and Computing Knowldge Base](http://www.hepsoftware.org/?popupmode=Software&popupstate=cat).
+
+If you know of a particularly useful or critical software package then
+please [add it to the knowledge base](http://hepsoftware.org/?e=wenaus.201510251113185035029&detailmode=Entity&detailstate=on)
+or [let us know about it](mailto:[email protected]).