Update README.md

README.md

-Society.ttl contains the definition of individuals that are generic. 
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+The repertory weather2017 is about the transformation process from CSV files.
+The dataset contains  weather measurements from August 2017 to December 2017.
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+The repertory weather2018 is about the transformation process from the PostgreSQL table wdonnees. 
+This dataset contains weather measurements from August 2018 up to now.
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+Society.ttl contains the definition of individuals that are generic: Orgnization, Person, Location.
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