📝 Adding a README.

Adding README, including the old introduction from the very beginning of the game design which is slightly modified and listed in *How to Play* here.

README.md

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+# CrazySnake
+
+CrazySnake is a game rooted in the gameplay of *Snake*.
+This game refreshed the fundamental controlling logic of *Snake* and created a super hard version of it.
+Note tha about 65% gamers failed this game at the first step. Consider carefully before you crash into your keyboard.
+
+## How to Play
+
+- 打开游戏，点击画面如幻灯片翻过起始页面，进入主菜单。
+- 在主菜单中进入游戏，使用wasd控制蛇的前进，注意控制过程定义如下，
+  - 每一次【有效操作】时，蛇对对上一个【有效操作】作出【反应】，
+  - 【有效操作】指【反应】时除了让蛇【掉头】和【继续直走】之外的操作。
+- 标题栏有16个不同tip随机出现。
+
+![图片](https://user-images.githubusercontent.com/47021599/200893661-2d0a5e48-a483-42cb-a2af-8287825b8514.png)
+
+**NOTE: This is a sketching project developed before 2014, this is an online archive.**