Update README.md

Author: loubnabnl

README.md

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-# the-stack-v2
+# The Stack v2 & StarCoder2Data
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+In this repository you can find the code for building The Stack v2 dataset, as well as the extra sources used to make StarCoder2data: the training corpus of the StarCoder2 family of models.
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+This reposirory is a follow-up of on the work in [bigcode-dataset](https://github.com/bigcode-project/bigcode-dataset/) used for [The Stack v1](https://huggingface.co/datasets/bigcode/the-stack) and [StarCoderData](https://huggingface.co/datasets/bigcode/starcoderdata).