Implemented theme switcher as an exercise

package-lock.json

@@ -9,6 +9,7 @@
             "version": "0.1.0",
             "dependencies": {
                 "next": "16.1.4",
+                "next-themes": "^0.4.6",
                 "react": "19.2.3",
                 "react-dom": "19.2.3"
             },
@@ -5002,6 +5003,16 @@
                 }
             }
         },
+        "node_modules/next-themes": {
+            "version": "0.4.6",
+            "resolved": "https://registry.npmjs.org/next-themes/-/next-themes-0.4.6.tgz",
+            "integrity": "sha512-pZvgD5L0IEvX5/9GWyHMf3m8BKiVQwsCMHfoFosXtXBMnaS0ZnIJ9ST4b4NqLVKDEm8QBxoNNGNaBv2JNF6XNA==",
+            "license": "MIT",
+            "peerDependencies": {
+                "react": "^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc",
+                "react-dom": "^16.8 || ^17 || ^18 || ^19 || ^19.0.0-rc"
+            }
+        },
         "node_modules/next/node_modules/postcss": {
             "version": "8.4.31",
             "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",