warning: LF will be replaced by

Q：What is CRLF & LF？

A：The CRLF stands for Carriage Return Line Feed, and the LF stands for Line Feed.

In windows system, wo should go to next line with CRLF, and in other systems like unix, mac, we should go to next line with LF.
So in git bash, when adding files to local respository, it will raise this warning.

Reference:

https://www.jianshu.com/p/b03ad01acd69