add gso-run-cli

gso/main.py

 """The main module that runs :term:`GSO`."""
 
+import os
+
 from gso import init_cli_app, init_gso_app
 
 app = init_gso_app()
 
+
+def run_cli():
+    os.chdir(os.path.dirname(os.path.abspath(__file__)))
+    init_cli_app()
+
+
 if __name__ == "__main__":
     init_cli_app()