create documentation

README.md

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-# adguard-ddns-client
-A script for adding a dynamic ip address as allowed client to AdGuard Home if hosted on a VPS.
+# AdGuard Home Whitelist DDNS Client
+A script for adding a dynamic ip address as an allowed client to AdGuard Home. Useful if you host AdGuard Home on a VPS and your router doesn't supports DNS over HTTPS (DoH) or DNS over TLS (DoT).
+
+GitHub: https://github.com/michivonah/adguard-ddns-client
+
+You can run this python script manually or via the docker container. I recommend using the docker container. But you also can run the python script manually when you need it.
+
+Use as docker container on your server:
+1. Install docker on your system
+
+    ```apt-get install docker.io docker-compose -y```
+2. Open your cronjob
+
+    ```crontab -e```
+
+3. Add the following line and change the enviromental variables to your server
+
+    ```0 * * * * docker run -d --rm --env API_BASE_URL="https://example.com" --env API_USERNAME=YOUR_USER --env API_PASSWORD=YOUR_PASSWORD --env DOMAIN_NAME=YOUR_DDNS_DOMAIN adguard-ddns-client```
+
+4. Finished. Now the cronjobs runs every hour and adds the clients ip address if it is missing.
+
+## Enviormental variables
+These environment variables are supported
+
+| Variable | Description | Example |
+| --- | --- | --- |
+| API_BASE_URL | The url of your AdGuard Home Server | ``https://example.com`` |
+| API_USERNAME | The username of your AdGuard Home Administrator Account | ``admin`` |
+| API_PASSWORD | The password of your AdGuard Home Administrator Account | ``admin123`` (use a secure password) |
+| DOMAIN_NAME | Your DDNS Domain name with the ip address you want to whitelist | ``ddns.example.com`` |
+
+> Required enviromental variables: API_BASE_URL, API_USERNAME, API_PASSWORD, DOMAIN_NAME
+