Add a script to add the status bar to the screenshots

The ones generated by the flutter driver do not have status bars

scripts/finalize_screenshots.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+#
+# This script adds the status bar on top of all the images
+# It is required as flutter driver screenshot does not include the status bar
+#
+
+set -eu
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+cd "$SCRIPT_DIR/.."
+
+DIR_NAME='./screenshots'
+cd $DIR_NAME
+
+for i in *.png; do
+    FILE_NAME=$(basename "${i}" .png)_final.jpg
+    echo "Converting $i -> $FILE_NAME"
+
+    convert "${i}" "$SCRIPT_DIR/status_bar.png" -composite "${FILE_NAME}"
+done