wwan: add initial documentation

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+.. _wwan-interface:
+
+####################
+WirelessModem (WWAN)
+####################
+
+Configuration
+#############
+
+The wirelessmodem interface provides access (through a wireless modem/wwan) to
+wireless networks provided by various cellular providers. VyOS uses the
+interfaces wirelessmodem subsystem for configuration.
+
+Address
+-------
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> apn <apn>
+
+   Every WWAN connection requires an :abbr:`APN (Access Point Name)` which is
+   used by the client to dial into the ISPs network. This is a mandatory
+   parameter. See the following list of well-known APNs:
+
+   - AT&T (isp.cingular)
+   - Deutsche Telekom (internet.t-d1.de or internet.telekom)
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> backup distance <metric>
+
+   Configure metric of the default route added via the Wireless Modem interface.
+   The default metric if not specified is 10.
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> device <tty>
+
+   Device identifier of the underlaying physical interface. This is usually a
+   ttyUSB device, if not configured this defaults to ttyUSB2.
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> no-peer-dns
+
+   Do not install DNS nameservers received from ISP into system wide nameserver
+   list.
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> ondemand
+
+   Enables or disables on-demand WWAN connection.
+
+   Use this command to instruct the system to establish a PPP connection
+   automatically once traffic passes through the interface. A disabled on-demand
+   connection is established at boot time and remains up. If the link fails for
+   any reason, the link is brought back up immediately.
+
+Link Administration
+-------------------
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> description <description>
+
+   Assign given `<description>` to interface. Description will also be passed
+   to SNMP monitoring systems.
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> disable
+
+   Disable given `<interface>`. It will be placed in administratively down
+   state.
+
+.. cfgcmd:: set interfaces wirelessmodem <interface> mtu <mtu>
+
+   Configure :abbr:`MTU (Maximum Transmission Unit)` on given `<interface>`. It
+   is the size (in bytes) of the largest ethernet frame sent on this link.
+
+
+
+Operation
+=========