add initial files

src/renderer/themes/dark.scss

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+body[data-theme='dark'] {
+}

src/renderer/themes/default.scss

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+:root {
+  --icon-color: #ffffff;
+
+  --primary-color: #3a81ed;
+  --secondary-color: #c7648d;
+
+  --content-bg: #181819;
+  --content-text-color: #c1c2bb;
+
+  --titlebar-bg: #1d1d1d;
+
+  --sidebar-bg: #101010;
+  --sidebar-btn-color: #b3b3b3;
+  --sidebar-btn-color-hover: #dddddd;
+  --sidebar-handle-bg: #4d4d4d;
+
+  --playerbar-bg: #181818;
+  --playerbar-text-primary-color: #e7e7e7;
+  --playerbar-text-secondary-color: #a8a8a8;
+  --playerbar-btn-color: #c5c5c5;
+  --playerbar-btn-color-hover: #ffffff;
+  --playerbar-border-top: 1px rgba(50, 50, 50, 0.7) solid;
+  --playerbar-slider-track-bg: #3c3f43;
+  --playerbar-slider-track-progress-bg: #cccccc;
+
+  --tooltip-bg: #ffffff;
+  --tooltip-text-color: #000000;
+
+  --scrollbar-track-bg: #181818;
+  --scrollbar-thumb-bg: #5a5a5a;
+}