Added help message to all cli commands

src/cpl_cli/command/install_service.py

@@ -1,6 +1,7 @@
 import json
 import os
 import subprocess
+import textwrap
 
 from packaging import version
 
@@ -39,6 +40,11 @@ class InstallService(CommandABC):
 
         self._project_file = f'{self._config.get_configuration("ProjectName")}.json'
 
+    @property
+    def help_message(self) -> str:
+        return textwrap.dedent("""\
+        """)
+
     def _install_project(self):
         """
         Installs dependencies of CPl project