Add nord theme with license header, update all theme files with license

nord.css

@@ -0,0 +1,78 @@
+/* nord color theme by Arctic Ice Studio
+ * https://www.nordtheme.com/
+ * MIT License: https://github.com/nordtheme/visual-studio-code/blob/develop/LICENSE
+ */
+
+:root {
+    /* Polar Night (darkest to lightest dark) */
+    --black: #2e3440;
+    --black-light: #383e4b;
+    --black-dark: #232934;
+
+    --dark: #3b4252;
+    --dark-light: #434c5e;
+    --dark-dark: #2e3440;
+
+    --gray-darker: #434c5e;
+    --gray-darker-light: #4c566a;
+    --gray-darker-dark: #3b4252;
+
+    --gray-dark: #4c566a;
+    --gray-dark-light: #5a657c;
+    --gray-dark-dark: #434c5e;
+
+    --gray: #d8dee9;
+    --gray-light: #e5e9f0;
+    --gray-dark: #bcc6d4;
+
+    --gray-light: #e5e9f0;
+    --gray-light-light: #eceff4;
+    --gray-light-dark: #d8dee9;
+
+    /* Snow Storm (lightest) */
+    --stone: #eceff4;
+    --stone-light: #f3f6fa;
+    --stone-dark: #d8dee9;
+
+    --icon: #d8dee9;
+    --icon-light: #e5e9f0;
+    --icon-dark: #bcc6d4;
+
+    --bone: #d8dee9;
+    --bone-light: #e5e9f0;
+    --bone-dark: #bcc6d4;
+
+    --chalk: #eceff4;
+    --chalk-light: #f3f6fa;
+    --chalk-dark: #d8dee9;
+
+    /* Frost (blue-green accents) */
+    --blue: #5e81ac;
+    --blue-light: #81a1c1;
+    --blue-dark: #4c678f;
+
+    /* Aurora (colorful accents) */
+    --orange: #d08770;
+    --orange-light: #e09988;
+    --orange-dark: #bf6f5a;
+
+    --yellow: #ebcb8b;
+    --yellow-light: #ecd39d;
+    --yellow-dark: #d6b676;
+
+    --red: #bf616a;
+    --red-light: #d07b85;
+    --red-dark: #a3505a;
+
+    --brown: #d08770;
+    --brown-light: #e09988;
+    --brown-dark: #bf6f5a;
+
+    --pink: #b48ead;
+    --pink-light: #c4a2be;
+    --pink-dark: #9c7a96;
+
+    --green: #a3be8c;
+    --green-light: #b4cc9d;
+    --green-dark: #8ea579;
+}