Use eslint-plugin-prettier and update readme

prettier.config.mjs

@@ -0,0 +1,12 @@
+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+	trailingComma: 'es5',
+	tabWidth: 4,
+	semi: true,
+  doubleQuote: true,
+};
+
+export default config;