With nmcli, it is very easy to create a bridge "br0". The following script illustrates how:

The script will create the interface and migrate the enp3s0 interface to be a slave to the bridge.

!/bin/sh -e

sudo nmcli con add type bridge ifname br0
sudo nmcli con mod bridge-br0 bridge.stp no
sudo nmcli con add type bridge-slave ifname ${INTERFACE} master bridge-br0
sudo reboot