feat: add __init__ file

Author: SepineTam

src/openai_api_polling/__init__.py

@@ -0,0 +1,13 @@
+from importlib.metadata import version
+
+
+__version__ = version("openai-api-polling")
+__author__ = ["Song Tan <sepinetam@gmail.com>"]
+
+
+def main() -> None:
+    print("Hello from openai-api-polling!")
+
+
+if __name__ == "__main__":
+    main()