Update README.md

README.md

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+This is a preprocessed version of the realnewslike subdirectory of C4
+
+C4 from: https://huggingface.co/datasets/allenai/c4
+
+Files generated by using Megatron-LM https://github.com/NVIDIA/Megatron-LM/
+```
+python tools/preprocess_data.py \
+  --input 'c4/realnewslike/c4-train.0000[0-9]-of-00512.json' \
+  --partitions 8 \
+  --output-prefix preprocessed/c4 \
+  --tokenizer-type GPTSentencePieceTokenizer \
+  --tokenizer-model tokenizers/tokenizer.model \
+  --workers 8
+```
+
 ---
 license: odc-by
 ---