Added help messages to cli commands

src/cpl_cli/command/publish_service.py

@@ -18,6 +18,8 @@ class PublishService(CommandABC):
     @property
     def help_message(self) -> str:
         return textwrap.dedent("""\
+        Prepares files for publish into an output directory named dist/ at the given output path and executes setup.py.
+        usage: cpl publish
         """)
 
     def run(self, args: list[str]):