Add dataset card

README.md

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+This repository contains the mapping from integer id's to actual label names (in HuggingFace Transformers typically called `id2label`) for several datasets.
+
+Current datasets include:
+- ImageNet-1k
+- ImageNet-22k
+- COCO detection
+
+You can read in a label file as follows (using the `huggingface_hub` library):
+
+```
+from huggingface_hub import hf_hub_url, cached_download
+import json
+
+REPO_ID = "datasets/huggingface/label-files"
+FILENAME = "imagenet-22k-id2label.json"
+id2label = json.load(open(cached_download(hf_hub_url(REPO_ID, FILENAME)), "r"))
+id2label = {int(k):v for k,v in id2label.items()}
+```
+
+To add an id2label mapping for a new dataset, simply define a Python dictionary, and then save that dictionary as a JSON file, like so:
+```
+import json
+
+# simple example
+id2label = {0: 'cat', 1: 'dog'}
+
+with open('cats-and-dogs-id2label.json', 'w') as fp:
+    json.dump(id2label, fp)
+```