added dark theme

Author: V-Code18

Chess-Game/dark.css

@@ -0,0 +1,22 @@
+/* Dark Theme Styles */
+html, body {
+    background-color: #333;
+    color: #fff;
+}
+
+#turn {
+    background: #444;
+    border-color: #222;
+}
+
+.turnhighlight {
+    background: #5cb85c;
+    color: #fff;
+}
+
+.gamecell {
+    background: #555;
+    border-color: #222;
+}
+
+/* Add any other specific dark theme styles here */

Chess-Game/light.css

@@ -0,0 +1,22 @@
+/* Light Theme Styles */
+html, body {
+    background-color: #fff;
+    color: #333;
+}
+
+#turn {
+    background: #fff;
+    border-color: #000;
+}
+
+.turnhighlight {
+    background: #5cb85c;
+    color: #fff;
+}
+
+.gamecell {
+    background: #ccc;
+    border-color: #000;
+}
+
+/* Add any other specific light theme styles here */