Create README.md

README.md

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+---
+pretty_name: C4 200M Grammatical Error Correction Dataset
+languages:
+- en
+source_datasets:
+- C4/en/3.0.1
+task_categories:
+- grammatical error correction
+- sequence-modeling
+---
+# C4 200M
+# Dataset Summary
+c4_200m is a collection of 185 million sentence pairs generated from the cleaned English dataset from C4. This dataset can be used in grammatical error correction (GEC) tasks.
+
+The corruption edits and scripts used to synthesize this dataset is referenced from: [C4_200M Synthetic Dataset](https://github.com/google-research-datasets/C4_200M-synthetic-dataset-for-grammatical-error-correction)
+
+# Description
+As discussed before, this dataset contains 185 million sentence pairs. Each article has these two attributes: input and output. Here is a sample of dataset:
+```
+input: Bitcoin is for $7,094 this morning, which CoinDesk says.
+output: Bitcoin goes for $7,094 this morning, according to CoinDesk.
+```