Create README.md

This is the QRECC dataset arranged to be used for a query rewriting task.
Each line is composed as follow:
>>INTRODUCTION<< token is followed by the PREVIOUS TURNS of the conversation together WITH THE ANSWERS provided in the dataset
>>QUESTION<< token is followed by the current query the system should rewrite
>>ANSWER<< token is followed by the rewriting of the current query

README.md

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+---
+task_categories:
+- conversational
+- question-answering
+language:
+- en
+---
+