Initial commit of Sphinx docs

Change-Id: I9fca8fb98502dffc2555f9de7f507b6f006e0e77
Signed-off-by: John DeNisco <jdenisco@cisco.com>

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+.. _running:
+
+Running VPP
+===========
+
+.. toctree::
+
+'vpp' Usergroup
+---------------
+
+When VPP is installed, a new usergroup *'vpp'* is created. To avoid running the
+VPP CLI (vppctl) as root, add any existing users to the new group that need to
+interact with VPP:
+
+.. code-block:: console
+
+    $ sudo usermod -a -G vpp user1
+
+Update your current session for the group change to take effect: 
+
+.. code-block:: console
+
+    $ newgrp vpp
+
+
+VPP Systemd File - 'vpp.service'
+--------------------------------
+
+When the VPP is installed, a systemd service files is also installed. This
+file, vpp.service (Ubuntu: /lib/systemd/system/vpp.service and CentOS:
+/usr/lib/systemd/system/vpp.service), controls how VPP is run as a service. For
+example, whether or not to restart on failure and if so, with how much delay.
+Also, which UIO driver should be loaded and location of the *'startup.conf'*
+file.
+
+.. code-block:: console
+
+    $ cat /usr/lib/systemd/system/vpp.service
+    [Unit]
+    Description=Vector Packet Processing Process
+    After=syslog.target network.target auditd.service
+    
+    [Service]
+    ExecStartPre=-/bin/rm -f /dev/shm/db /dev/shm/global_vm /dev/shm/vpe-api
+    ExecStartPre=-/sbin/modprobe uio_pci_generic
+    ExecStart=/usr/bin/vpp -c /etc/vpp/startup.conf
+    Type=simple
+    Restart=on-failure
+    RestartSec=5s
+
+    [Install]
+    WantedBy=multi-user.target
+
+.. note::
+
+    Some older versions of the *'uio_pci_generic'* driver don't bind all
+    the supported NICs properly, so the *'igb_uio'* driver built from DPDK
+    needs to be installed. This file controls which driver is loaded at boot.
+    *'startup.conf'* file controls which driver is used.