add prettier config

prettier.config.js

@@ -0,0 +1,19 @@
+
+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+  trailingComma: "es5",
+  useTabs: false,
+  bracketSpacing: true,
+  objectWrap: "preserve",
+  tabWidth: 4,
+  semi: false,
+  singleQuote: true,
+  bracketSameLine: true,
+  arrowParens: "always",
+  endOfLine: "crlf"
+}
+
+module.exports = config