add package overview.

szyhf · Jun 28, 2018 · 19abfca · 19abfca
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+// Package excel provide a simple and light reader to read `*.xlsx` as a relate-db-like table.
+// See `ReadMe.md` or `Examples` for more usage.
 package excel
 
 // NewConnecter make a new connecter to connect to a exist xlsx file.