Add version command

Author: woojiahao

app/commands/version.py

@@ -0,0 +1,10 @@
+import click
+
+from app.utils.click_utils import info
+from app.version import __version__
+
+
+@click.command()
+@click.pass_context
+def version(_: click.Context) -> None:
+    info(f"Git-Mastery CLI is currently {__version__}")