[nautilus] OVERVIEW: rename to OVERVIEW.md

[Carlos Soriano Sánchez <csoriano src gnome org>]

commit 6d8718fd43b460de6bcb0ef5373ee5e0ffc83531
Author: Carlos Soriano <csoriano gnome org>
Date:   Wed Dec 23 15:00:20 2015 +0100

    OVERVIEW: rename to OVERVIEW.md
    
    Since it's mark down syntax

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