Be more helpful when config.toml cannot be written

stechuhr_client/config.py

@@ -85,9 +85,14 @@ def initialize_config(application_name: str, default_config: str) -> dict:
 
     # Create a default config if it does exist
     if not Path.is_file(Path(config_path)):
+        try:
         write_config(config_path, default_strconfig)
             print("Created new default config.toml at:\n{}".format(config_path))
             config = read_config(config_path)
+        except PermissionError as e:
+            print("Error: Not sufficient permissions to write default config.toml into directory {} (as user {})".format(config_dir, getpass.getuser()), file=sys.stderr)
+            print("Consider changing permissions on {} manually so writing is allowed for user {}. After initial write of default config.toml on the first run {} won't write that file ever again. so you can make it read only for {} after that".format(config_dir, getpass.getuser(), application_name, getpass.getuser()), file=sys.stderr)
+            exit(1)
     else:
         config = read_config(config_path)
         if config_has_missing_keys(config, default_config, default_strconfig):