Added help messages to cli commands

src/cpl_cli/command/version_service.py

@@ -22,6 +22,8 @@ class VersionService(CommandABC):
     @property
     def help_message(self) -> str:
         return textwrap.dedent("""\
+        Lists the version of CPL, CPL CLI and all installed packages from pip.
+        usage: cpl version
         """)
 
     def run(self, args: list[str]):