add excel support

app.py

@@ -55,6 +55,7 @@ from langchain.document_loaders import (
     UnstructuredODTLoader,
     UnstructuredPowerPointLoader,
     UnstructuredWordDocumentLoader,
+    UnstructuredExcelLoader
 )
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.docstore.document import Document
@@ -106,6 +107,8 @@ LOADER_MAPPING = {
     ".ppt": (UnstructuredPowerPointLoader, {}),
     ".pptx": (UnstructuredPowerPointLoader, {}),
     ".txt": (TextLoader, {"encoding": "utf8"}),
+    ".xls": (UnstructuredExcelLoader, {}),
+    ".xlsx": (UnstructuredExcelLoader, {"mode":"elements"}),
     # Add more mappings for other file extensions and loaders as needed
 }