added Docker

Support OpenVPN Docker

README.md

@@ -10,6 +10,20 @@ Run the script and follow the assistant:
 
 Once it ends, you can run it again to add more users, remove some of them or even completely uninstall OpenVPN.
 
+### Docker Installation
+Run the script and follow the assistant:
+
+`docker run -it \
+--name openvpn \
+--restart always \
+--cap-add=NET_ADMIN \
+--privileged \
+--device=/dev/net/tun \
+-p 1194:1194/udp \
+mehran/openvpn`
+
+* You can change Port to any.
+
 ### I want to run my own VPN but don't have a server for that
 You can get a little VPS from just $1/month at [VirMach](https://billing.virmach.com/aff.php?aff=4109&url=billing.virmach.com/cart.php?gid=1).