Add backend bridge support

virtweb_docs/BRIDGE.md

@@ -0,0 +1,44 @@
+# Bridges
+
+Bridges can be used to connect virtual machines to networks.
+
+## Setup Bridge on Ubuntu
+
+1. Install dependencies:
+
+```bash
+sudo apt install bridge-utils
+```
+
+2. Adapt your netplan configuration to set the following:
+
+```yaml
+network:
+  version: 2
+  renderer: networkd
+  ethernets:
+    enp2s0:
+      dhcp4: no
+  bridges:
+    br0: # Bridge name
+      dhcp4: yes
+      interfaces:
+         - enp2s0 # Set to your interface
+```
+
+
+3. Apply netplan configuration:
+
+```bash
+sudo netplan apply
+```
+
+
+4. Get the state and the list of bridges in the system:
+
+```bash
+sudo brctl show
+```
+
+## Reference
+[How to Configure Network Bridge in Ubuntu](https://www.tecmint.com/create-network-bridge-in-ubuntu/)