openvpn3: add page (#6107)

pages/linux/openvpn3.md

@@ -0,0 +1,24 @@
+# openvpn3
+
+> OpenVPN 3 Linux client.
+> More information: <https://community.openvpn.net/openvpn/wiki/OpenVPN3Linux>.
+
+- Start a new VPN session:
+
+`openvpn3 session-start --config {{path/to/config.conf}}`
+
+- List established sessions:
+
+`openvpn3 sessions-list`
+
+- Disconnect the currently established session started with given configuration:
+
+`openvpn3 session-manage --config {{path/to/config.conf}} --disconnect`
+
+- Import VPN configuration:
+
+`openvpn3 config-import --config {{path/to/config.conf}}`
+
+- List imported configurations:
+
+`openvpn3 configs-list`