just test for the dir
add two bash Books
rm 1.cpp test.txt
move the bash book to bash dir
rm bash.pdf
add README.MD
rename the READEME
nothing
Create test.txt
delete README.MD
new README.md
Update README.md

add the ProgGit
Update README.md

add bash 图书
Update README.md

modify the link add
Update README.md

nothing
Update README.md

nothing
Update README.md

nothing
Update README.md

nothing
Update README.md