Update README.md

README.md

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+## Gold standard annotations for profession detection in Spanish COVID-19 tweets
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+The entire corpus contains 10,000 annotated tweets. It has been split into training, validation, and test (60-20-20). The current version contains the training and development set of the shared task with Gold Standard annotations. In addition, it contains the unannotated test, and background sets will be released.
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+For Named Entity Recognition, profession detection, annotations are distributed in 2 formats: Brat standoff and TSV. See the Brat webpage for more information about the Brat standoff format (https://brat.nlplab.org/standoff.html). 
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+The TSV format follows the format employed in SMM4H 2019 Task 2:
+tweet_id  |  begin  |  end  |  type  |  extraction
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+In addition, we provide a tokenized version of the dataset. It follows the BIO format (similar to CONLL). The files were generated with the brat_to_conll.py script (included), which employs the es_core_news_sm-2.3.1 Spacy model for tokenization.
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 Files of Named Entity Recognition subtask. 
 
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