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README添加实验一
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## 实验一
### 题目
利用uCore的中断机制,编程实现一个计时器( 秒表 ),可以实现正计时和倒计时。先选择计时模式,输入“A”为正计时,“B”为倒计时。若选择倒计时,则要先输入初始时间(秒数)。按“S”开始正(倒)计时,按“P”暂停正(倒)计时,按“C”继续正(倒)计时,按“E”停止正(倒)计时,暂停正(倒)计时或停止正(倒)计时时显示计时(剩余)时间值(秒数)。(时间精确到0.1秒)
### 效果
![](assets/实验一演示.gif)
### 原理
在trap.c文件中,在计时器中断(IRQ_OFFSET + IRQ_TIMER)和键盘中断(IRQ_OFFSET + IRQ_KBD)的部分添加状态转换、输入、输出。
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