README: Include a screenshot

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ A simple GUI to make managing declarative nix-env easier
 
 It has two buttons: "Edit Configuration" and "Apply Configuration"
 
+![screenshot](nix-env-apps/blob_plain/HEAD:/screenshot.png)
+
 The "Edit Configuration" button launches an editor on
 `~/.config/nixpkgs/overlays/userPackages.nix`, creating it with a
 useful template if it doesn't exist.  All you have to do is put the

diff --git a/screenshot.png b/screenshot.png
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Binary files /dev/null and b/screenshot.png differ