Added help message to all cli commands

src/cpl_cli/command/new_service.py

@@ -1,5 +1,6 @@
 import os
 import sys
+import textwrap
 from typing import Optional
 
 from packaging import version
@@ -46,6 +47,11 @@ class NewService(CommandABC):
         self._use_startup: bool = False
         self._use_service_providing: bool = False
 
+    @property
+    def help_message(self) -> str:
+        return textwrap.dedent("""\
+        """)
+
     @staticmethod
     def _help(message: str):
         """