update readme

README.md

@@ -23,10 +23,22 @@
 
 Neos is web version of [Yu-Gi-Oh!](https://www.yugioh-card.com/en/) game written in [TypeScript](https://www.typescriptlang.org/), [React.js](https://reactjs.org/) and [Babylon.js](https://www.babylonjs.com/). It supports the following features:
 
-- [Play online](https://neos.moecube.com) with the [ygopro](https://ygopro.org/) client or Neos itself
+- [Play online](https://neos.moecube.com) with the [ygopro](https://ygopro.org/) client or neos itself
 - Play with LAN connection
 - Duel with AI
 
+## Quick Start
+1. Open the [neos page](https://neos.moecube.com) and input the player name(e.g., ccc) and password(use "AI" if you want to duel with computer), then click `ENTER ROOM` button
+2. After entering in the waiting room, there're two ways to choose your deck:
+  - Using the recommended deck by clicking the drop-down menu
+  - Uploading your favorite deck with `YDK` file
+3. With the deck being chosen, click the `Ready` and `Start` button and enjoy the duel!
+
+<center class="half">
+  <img alt="" src="./screenshots/quick_start-login.jpeg" width="400" />
+  <img alt="" src="./screenshots/quick_start-room.jpeg" width="400" />
+</center>
+
 ## Screenshot
 <p align="center">
   <img alt="" src="./screenshots/duel.png" width="512">