style: add .prettierrc and format cmds

.prettierrc

@@ -0,0 +1,9 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "jsxSingleQuote": true,
+  "arrowParens": "always",
+  "trailingComma": "none",
+  "bracketSpacing": true,
+  "useTabs": true
+}

package.json

@@ -6,7 +6,9 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "format": "prettier --check './src/**/*.{js,jsx,ts,tsx,css,md,json}' --config ./.prettierrc",
+    "format:apply": "prettier --write './src/**/*.{js,jsx,ts,tsx,css,md,json}' --config ./.prettierrc"
   },
   "dependencies": {
     "next": "16.1.1",