docs: add meta copyright header (strands-agents#153)

Author: seyeong-han

src/strands/models/llamaapi.py

@@ -1,3 +1,4 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates
 """Llama API model provider.
 
 - Docs: https://llama.developer.meta.com/

tests-integ/test_model_llamaapi.py

@@ -1,3 +1,4 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates
 import os
 
 import pytest

tests/strands/models/test_llamaapi.py

@@ -1,3 +1,4 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates
 import json
 import unittest.mock