[adwaita-icon-theme: 1/3] readme: Use markdown suffix

[Jakub Steiner <jimmac src gnome org>]

commit 3942a05c41b78934ac2838ea6f806ba1d4295c21
Author: Juraj Fiala <jurf riseup net>
Date:   Sat Nov 24 15:44:57 2018 +0000

    readme: Use markdown suffix
    
    Since it is already valid markdown, add the suffix so that Gitlab formats it nicely.

 README => README.md | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
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diff --git a/README b/README.md
similarity index 100%
rename from README
rename to README.md