Add draft links for firstapp guides
Add draft links for firstapp guides

Adds links to the draft version of Writing your First Application
for shade, fog, dotnet and pkgcloud.

Change-Id: Ic353c88e3d9f51d14a8c60486ca5ceb00af7999e

openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals