commit 792899e39a549678a3cad126aba126d987be28ae
Author: Leszek Koltunski <leszek@koltunski.pl>
Date:   Mon Dec 6 13:24:46 2021 +0100

    Add two missing files.

diff --git a/src/main/res/drawable/ui_difficulty_checked.png b/src/main/res/drawable/ui_difficulty_checked.png
new file mode 100644
index 00000000..fb089a0c
Binary files /dev/null and b/src/main/res/drawable/ui_difficulty_checked.png differ
diff --git a/src/main/res/drawable/ui_difficulty_unchecked.png b/src/main/res/drawable/ui_difficulty_unchecked.png
new file mode 100644
index 00000000..9de58a17
Binary files /dev/null and b/src/main/res/drawable/ui_difficulty_unchecked.png differ