Add UnstructuredReader with support for various legacy files (.doc, .xls) (#99)

knowledgehub/loaders/__init__.py

@@ -2,6 +2,7 @@ from .base import AutoReader, DirectoryReader
 from .excel_loader import PandasExcelReader
 from .mathpix_loader import MathpixPDFReader
 from .ocr_loader import OCRReader
+from .unstructured_loader import UnstructuredReader
 
 __all__ = [
     "AutoReader",
@@ -9,4 +10,5 @@ __all__ = [
     "MathpixPDFReader",
     "OCRReader",
     "DirectoryReader",
+    "UnstructuredReader",
 ]