add prettierrc

Author: thomasJang

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

src/App.tsx

@@ -1,7 +1,7 @@
-import React from "react";
-import logo from "./logo.svg";
-import "./App.css";
-import "./test.less";
+import React from 'react';
+import logo from './logo.svg';
+import './App.css';
+import './test.less';
 
 const App: React.FC = () => {
   return (