feat: add main entrypoint with skeleton code

dnsupdate.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+"""A script which sends a Dynamic DNS update to the Ionos API."""
+
+from pathlib import Path
+import requests
+from yaml import load
+try:
+    from yaml import CLoader as Loader
+except ImportError:
+    from yaml import Loader
+
+
+def main():
+    path_to_config_file = Path("config.yml").resolve()
+
+    # TODO Check if config file exists
+
+    # TODO parse config file
+
+    # TODO retrieve DNS update URL
+
+    # TODO send update
+
+
+if __name__ == "__main__":
+    main()