[gnome-boxes-logos] Add NixOS logo

[Felipe Borges <felipeborges src gnome org>]

commit 6550ec64b55fcd11b6f43cb59045c60f05b4e596
Author: Martin Milata <martin martinmilata cz>
Date:   Sun Mar 29 01:53:02 2020 +0100

    Add NixOS logo

 logos/NixOS.svg | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/logos/NixOS.svg b/logos/NixOS.svg
new file mode 100644
index 0000000..5742066
--- /dev/null
+++ b/logos/NixOS.svg
@@ -0,0 +1 @@
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