Extension: Add settings for day and night color scheme

src/enums/ColorScheme.js

@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: Night Theme Switcher Contributors
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/**
+ * Color Schemes.
+ *
+ * @readonly
+ * @enum {string}
+ */
+export const ColorScheme = {
+    DEFAULT: 'default',
+    PREFER_DARK: 'prefer-dark',
+    PREFER_LIGHT: 'prefer-night',
+};