add upload_file folder

app.py

@@ -4,7 +4,10 @@ from tablecv import extract_table
 img_name = st.file_uploader("Upload an image with table(s)")
 if img_name is not None:
    st.image(img_name)
-   with open(img_name.name, "wb") as f:
+   isExist = os.path.exists("upload_file")
+   if not isExist:
+       os.makedirs("upload_file")
+   with open("upload_file/"+img_name.name, "wb") as f:
         f.write(img_name.getbuffer())
    extracted_tables = extract_table(image_path=img_name.name)