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Fix image in README.md

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The image in README.md seems broken

There should be highlighting in keystroke playback TextArea.

The text inside the boxes should either be adjustable, or be able to fit inside the boxes.

A grade report should be generated after the teacher halts the exam.

When a user shutdowns the client abnormally, his (her) user object will remain in OnlineUsers.users. This makes the server think the user is still online. I should implement a KeepAlive...

How to reproduce bug: ``` Set offset-y = 10 ```

`elf.sym['read']` gives an incorrect address on Ubuntu 20.04.3 LTS with gcc 9.3.0

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## Environment | Name | Version | | --- | --- | | OS | **Ubuntu 20.04.3 LTS (focal)** | | Pwntools | **4.6.0** | | gcc | **9.3.0-17ubuntu1~20.04** |...

想请教关于 Segmentation 的问题（gdt.c）

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大佬您好，我想请问下为什么 gdt.c 里面 kernel/user 的 code/data segment 都是 0~0xfffff 呢？ https://github.com/SilverRainZ/OS67/blob/master/kern/gdt.c#L56 这样的话 code 和 data segement 重叠了，是不是就没办法防止code段被其他程序写入？ 如果想明确的把他们分开，有没有什么比较好的办法呢？还是大佬觉得初学时先别在意这问题？ 谢谢大佬