add dataset metadata

README.md

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 - classification
 - multimedia
 pretty_name: playmydata
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+# About 
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+PlayMyData is a multi-purpose, comprehensive videogame dataset of videogames released from 1993 up to November 2023.
+It contains metadata like titles, platforms, a summary of the story, and release data. It also integrates data from HowLongToBeat on completion times.
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+Zenodo archive: https://zenodo.org/records/10262075
+Supporting GitHub repository: https://github.com/riccardoRubei/MSR2024-Data-Showcase 
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+# How to cite
+PlayMyData has been accepted at the 21st International Conference on Mining Software Repositories (MSR204) - Data Showcase track.
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+Preprint available here: https://arxiv.org/abs/2401.08561 
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