Update app.py

app.py

@@ -15,6 +15,7 @@ from chunk_python_code import chunk_python_code_with_metadata
 from vectorstore import get_chroma_vectorstore
 from download_repo_to_huggingface import download_and_upload_kadiAPY_repo_to_huggingfacespace
 from process_repo_zipfile import extract_files_and_filepath_from_dir
+from ragchain import RAGChain
 
 # Load environment variables from .env file
 load_dotenv()