Update README.md

wmo-im · Apr 30, 2021 · 9fb4aec · 9fb4aec
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 # CCT
-Common Code Tables
-Please work only on the csv version. The xml version of the table will be generated automatically after a push or pull_request
+The Common Code Tables are published to the [Manual on Codes, Volume I.2](https://library.wmo.int/index.php?lvl=notice_display&id=10684#.X18yfpMza3I) (WMO-No. 306) in Part C – Common Features to Binary and Alphanumeric Codes.
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+The CSV files are the working documents and the XML files are generated automatically after a push or pull_request.