Update README.md

README.md

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 This datasets repo contains the queries, passages/documents and judgements for the data used in the [DAPR](https://arxiv.org/abs/2305.13915) paper.
 
+DAPR is a benchmark for document-aware passage retrieval: given a (large) collection of documents, relevant passages within these documents for a given query are required to be returned. 
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+A key focus of DAPR is forcing/encouraging retrieval systems to utilize the document-level context which surrounds the relevant passages. An example is shown below:
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+<img src='https://raw.githubusercontent.com/UKPLab/acl2024-dapr/main/imgs/motivative-example.png' width='300'>
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+> In this example, the query asks for a musician or a group who has ever played at a certain venue. However, the gold relevant passage mentions only the reference noun, "the venue" but its actual name, "the Half Moon, Putney". The model thus needs to explore the context from the belonging document of the passage, which in this case means coreference resolution.
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 ## Overview
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 For the DAPR benchmark, it contains 5 datasets:
 | Dataset | #Queries (test) | #Documents | #Passages
 | --- |  --- | --- | --- |