ifconfig.md: Adding ifconfig command

pages/common/ifconfig.md

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+# ifconfig
+
+> ifconfig - Interface Configurator, used to configure network interfaces.
+
+- View network settings of an ethernet adapter.
+
+`ifconfig eth0`
+
+- Display details of all interfaces, including disabled interfaces.
+
+`ifconfig -a`
+
+- Disable eth0 interface.
+
+`ifconfig eth0 down`
+
+- Enable eth0 interface.
+
+`ifconfig eth0 up`
+
+- Assign IP address to eth0 interface.
+
+`ifconfig eth0 {{ip_address}}`