LF will be replaced by CRLF in git - What is that and is it important

Question

I was trying to create a new rails application and when I do git init git add I am getting this LF warning.

Example:

The file will have its original line endings in your working directory. warning: LF will be replaced by CRLF in Gemfile.

The file will have its original line endings in your working directory. warning: LF will be replaced by CRLF in Gemfile.lock.

The file will have its original line endings in your working directory. warning: LF will be replaced by CRLF in README.

My question is, What's the difference between LF and CRLF? Should I ignore this?