docs: Add TUN device (#940)

readme.md

@@ -37,6 +37,7 @@ services:
       VERSION: "11"
     devices:
       - /dev/kvm
+      - /dev/net/tun
     cap_add:
       - NET_ADMIN
     ports:
@@ -49,7 +50,7 @@ services:
 Via Docker CLI:
 
 ```bash
-docker run -it --rm -p 8006:8006 --device=/dev/kvm --cap-add NET_ADMIN --stop-timeout 120 dockurr/windows
+docker run -it --rm -p 8006:8006 --device=/dev/kvm --device=/dev/net/tun --cap-add NET_ADMIN --stop-timeout 120 dockurr/windows
 ```
 
 Via Kubernetes: