Add how to use in Ironic Section

Since Ironic is an integration project now. We should add one section
about it in Admin guide.
This commit is part of the bugfix since adding the whole section is
huge. This one is to add the sequence of how to use Ironic.

Change-Id: I35176fcec960110bfe62c68251a1dfd5d0d828cf
Partial-Bug: #1495898

doc/admin-guide-cloud/source/baremetal.rst

@@ -47,3 +47,26 @@ Bare Metal deployment
 #. Agent deploy process
 
 .. TODO Add the detail about the process of Bare Metal deployment.
+
+Use Bare Metal
+~~~~~~~~~~~~~~
+
+#. Install Bare Metal service.
+
+#. Setup Bare Metal driver in the compute node's :file:`nova.conf`.
+
+#. Setup TFTP folder and prepare PXE boot loader file.
+
+#. Prepare the baremetal flavor.
+
+#. Register the nodes with correct drivers.
+
+#. Configure the driver information.
+
+#. Register the ports information.
+
+#. Use nova boot to kick off the baremetal provision.
+
+#. Check nodes' provision state and power state.
+
+.. TODO Add the detail command line later on.