Add cli skeleton

Author: code-yeongyu

ygka/__init__.py

@@ -1,2 +1,5 @@
+from .cli import cli_app
+
+
 def main():
-    print('Hello, World!')
+    cli_app()

ygka/cli/__init__.py

@@ -0,0 +1,2 @@
+from .ygka import ygka_command as _  # noqa
+from .cli_app import cli_app as cli_app

ygka/cli/cli_app.py

@@ -0,0 +1,3 @@
+from typer import Typer
+
+cli_app = Typer()

ygka/cli/ygka.py

@@ -0,0 +1,8 @@
+from rich import print as pprint
+
+from .cli_app import cli_app
+
+
+@cli_app.command()
+def ygka_command():
+    pprint('[bold]Hello World![/bold]')