refactor

extract/psdonline/README.md

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+### List of extracted source
+- https://apps.fas.usda.gov/psdonline/app/index.html#/app/downloads
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+#### TODO/Evaluate
+Global Argricultural information service of USA, publishes reports on new developments globally as pdf files. Would need to do parsing/NLP to extract information but could be valuable source.
+- https://gain.fas.usda.gov/#/search
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+more from same source:
+- https://usda-eu.org/reports/commodities/