Update README.md

README.md

@@ -25,3 +25,67 @@ It is recommended to install this in a system directory.
 sudo mkdir -p /opt/ionos-ddns
 sudo git clone [https://github.com/TWOJA_NAZWA/ionos-ddns.git](https://github.com/TWOJA_NAZWA/ionos-ddns.git) /opt/ionos-ddns
 cd /opt/ionos-ddns
+
+### 2. Install dependencies
+'''
+sudo apt update
+sudo apt install python3-pip
+sudo pip3 install -r requirements.txt
+'''
+
+### 3. Configuration
+'''
+sudo nano config.json
+'''
+Fill in your api_prefix and api_secret.
+
+Domains List: Edit domains.txt and add domains one per line:
+'''
+sudo nano domains.txt
+'''
+Example:
+'''
+mydomain.com
+vpn.mydomain.com
+server.other-domain.net
+'''
+
+### 4. Install System Service
+Copy the service file to systemd directory:
+'''
+sudo cp ionos-ddns.service /etc/systemd/system/
+'''
+Reload daemon, enable and start the service:
+'''
+sudo systemctl daemon-reload
+sudo systemctl enable ionos-ddns.service
+sudo systemctl start ionos-ddns.service
+'''
+
+### Monitoring
+Check the service status:
+'''
+sudo systemctl status ionos-ddns.service
+'''
+View logs:
+'''
+tail -f /var/log/ionos-ddns.log
+'''
+
+### How it works
+The script runs in an infinite loop (every 10 minutes).
+
+Fetches your current Public IP.
+
+Reads domains.txt.
+
+For each domain:
+
+Finds the correct Zone ID via API.
+
+Checks if an A-Record exists.
+
+If exists: Checks if IP matches. If not, performs PUT (Update).
+
+If missing: Performs POST (Create).
+