Add a link of Unix philosophy to guide us for the command line program

[LinuxSuRen]

It's very important to have rules for the programming and code review.

References

• http://www.linfo.org/rule_of_silence.html
• https://www.techug.com/post/unix-17-philosophy-rule.html

I learned those links from @cndoit18

[cndoit18]

👍

[cndoit18]

References

• https://homepage.cs.uri.edu/~thenry/resources/unix_art/ch01s06.html