[WIP] Fix errors in Linux knowledge README

[Copilot]

• Understand the repository purpose and structure
• Add Linux knowledge content to README with intentional errors for students to practice finding and fixing
• Ensure errors are educational and cover common misconceptions
• Verify the content is appropriate for a Linux introductory course

Intentional errors included:

1. /root described as system root directory (should be /)
2. /temp instead of /tmp for temporary files
3. File permission values incorrect (r=2, w=4, x=1 instead of r=4, w=2, x=1)
4. kill -15 described as forced termination (should be kill -9 for SIGKILL)
5. CentOS uses apt (should be yum or dnf)
6. PATH separator is ; (should be : on Linux)
7. sudo requires root password (should be user's own password)
8. find described as faster than locate (opposite is true)

Original prompt

Linuxの知識が書かれたREADMEの中に、間違いがいくつかあるのでそこを修正するという練習リポジトリです。

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