[gnome-photos] Add vignette mask needed to implement Instagram Hefe

[Debarshi Ray <debarshir src gnome org>]

commit b5e24d46a72cd20185530c824038e91e4031a293
Author: Corey Hoard <corey coreyhoard com>
Date:   Sun Jan 24 03:30:45 2016 +0100

    Add vignette mask needed to implement Instagram Hefe
    
    Based on:
    http://www.coreyhoard.com/mirror/CH_Rev_Eng_Hefe_wDataset.zip

 data/vignette.png |  Bin 0 -> 132064 bytes
 1 files changed, 0 insertions(+), 0 deletions(-)
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diff --git a/data/vignette.png b/data/vignette.png
new file mode 100644
index 0000000..3826975
Binary files /dev/null and b/data/vignette.png differ