add prettier setup

react-advanced-tag1/.prettierrc.mjs

@@ -0,0 +1,12 @@
+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+  trailingComma: "es5",
+  tabWidth: 2,
+  semi: false,
+  singleQuote: true,
+};
+
+export default config;