Add llama model download alias for llama download

llama_toolchain/cli/model/download.py

@@ -0,0 +1,24 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import argparse
+
+from llama_toolchain.cli.subcommand import Subcommand
+
+
+class ModelDownload(Subcommand):
+    def __init__(self, subparsers: argparse._SubParsersAction):
+        super().__init__()
+        self.parser = subparsers.add_parser(
+            "download",
+            prog="llama model download",
+            description="Download a model from llama.meta.comf or HuggingFace hub",
+            formatter_class=argparse.RawTextHelpFormatter,
+        )
+
+        from llama_toolchain.cli.download import setup_download_parser
+
+        setup_download_parser(self.parser)