add installation manual for the OVA image

source/manual/how-tos/installova.rst

@@ -0,0 +1,45 @@
+=============================
+Installing OPNsense OVA image
+=============================
+
+OPNsense is available as an Open Virtual Appliance (OVA) package, which can be deployed in various
+virtualization products (e.g. VMWare, Virtualbox).
+
+The image is not provided as a community free download, but can be acquired from Deciso.
+
+In this document we describe the simple steps when deploying in VirtualBox, other supported platforms function quite
+similar.
+
+---------------------------
+Step 1 - Import appliance
+---------------------------
+
+In the top menu, choose :menuselection:`File --> Import appliance` and select the image you downloaded, it should
+show a dialog like the following.
+
+.. image:: images/ova_import_dialog_1.png
+    :width: 100%
+
+Just click import, accept the license and the image should be transferred to your machine.
+
+
+--------------------------
+Step 2 - Network setup
+--------------------------
+
+The OVA template comes with two interfaces configured by default (you can add more later if needed).
+Always choose the right type of network before using OPNsense, the imported adapters might not be assigned to a type after import.
+
+
+.. Note::
+
+    Please be aware that the order of the network cards in the virtualization product may differ from how they are
+    presented to the operating system. In VirtualBox "Adapter 1" seems to connect to WAN (em1)
+
+
+---------------------------------
+Step 3 - Initial configuration
+---------------------------------
+
+The virtual machine is operational now, initial configuration is performed similar to other setups, as described in
+:doc:`../install`.

source/manual/howtos.rst

@@ -31,6 +31,7 @@ How-tos
    how-tos/insight
    how-tos/interface_wireless_internal
    how-tos/installaws
+   how-tos/installova
    how-tos/ips-feodo
    how-tos/ips-geoip
    how-tos/ips-sslfingerprint