Add wireguard/README.md

wireguard/README.md

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+This script create a call point to checj the status of a remote WG server.
+
+1 - Open firewall to income traefik on port 9876. If using firewalld and depending your config:
+
+```
+sudo firewall-cmd --permanent --remove-rich-rule='rule family="ipv4" source address="origin_ip" port protocol="tcp" port="9876" accept'
+```
+
+2 - Enable and start the service:
+
+```
+sudo systemctl enable --now wg-health-api.service
+```
+
+3 - Check you WG interface name and change it in the Python script:
+
+```
+sudo wg show
+```
+
+4 - Test the call point be using curl from a machine in a diffrent IP to full test firewall and the script as example:
+
+```
+curl http://remote-wg-ip:9876/health
+{"message":"WireGuard interface \"wg0\" is active.","status":"ok"}
+```
+
+This can be added as example to uptime-kuma!