Add basic README

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+unicode-expand.pl
+=================
+
+This is a simple [irssi](https://irssi.org/) plugin to convert Unicode emojis etc into their textual representation, so ☕ would come out as [HOT BEVERAGE]. Put it in `~/.irssi/scripts/autorun/`.
+
+Released under [CC0](https://creativecommons.org/publicdomain/zero/1.0/) / as public domain code.