Add header and themes

src/features/gameCard/gameCard.tsx

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+export const GameCard = () => {
+  return <></>;
+};

src/features/gameCard/index.ts

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+import { GameCard } from "./gameCard";
+
+export { GameCard };

src/features/schemeSwitch/index.ts

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+import { SchemeSwitch } from "./schemeSwitch";
+
+export { SchemeSwitch };

src/features/schemeSwitch/schemeSwitch.tsx

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+"use client";
+
+import { SunIcon } from "@/shared/assets/icons";
+import { useTheme } from "next-themes";
+
+export const SchemeSwitch = () => {
+  const { theme, setTheme } = useTheme();
+
+  return (
+    <>
+      <SunIcon
+        className="mr-5 h-8 w-8 cursor-pointer"
+        onClick={() => setTheme(theme == "light" ? "dark" : "light")}
+      />
+    </>
+  );
+};