chore: add package.json and stylelint configuration

- Created package.json to manage development dependencies for stylelint.
- Added stylelint and related configurations in stylelint.config.mjs.

package.json

@@ -0,0 +1,8 @@
+{
+  "type": "module",
+  "devDependencies": {
+    "stylelint": "^16.19.1",
+    "stylelint-config-idiomatic-order": "^10.0.0",
+    "stylelint-config-standard": "^38.0.0"
+  }
+}

stylelint.config.mjs

@@ -0,0 +1,10 @@
+/** @type {import('stylelint').Config} */
+export default {
+    "extends": [
+        "stylelint-config-standard",
+        "stylelint-config-idiomatic-order"
+    ],
+    "plugins": [
+        "stylelint-order"
+    ]
+}