add manual download instructions

SNLI-VE.py

@@ -75,6 +75,16 @@ _FEATURES = datasets.Features(
 class SNLIVE(datasets.GeneratorBasedBuilder):
     """SNLIVE."""
 
+    @property
+    def manual_download_instructions(self):
+        return """\
+    You need to go to http://shannon.cs.illinois.edu/DenotationGraph/data/index.html,
+    and manually download the dataset ("Flickr 30k images."). Once it is completed,
+    a file named `flickr30k-images.tar.gz` will appear in your Downloads folder
+    or whichever folder your browser chooses to save files to.
+    Then, the dataset can be loaded using the following command `datasets.load_dataset("HuggingFaceM4/SNLI-VE", data_dir="<path/to/folder>")`.
+    """
+
     _LOCAL_IMAGE_FOLDER_NAME = "flickr30k-images"
     def _info(self):
         return datasets.DatasetInfo(