link to file github markdown code example
Example 1: how to create link in readme.md
[a link] (https://github.com/user/repo/blob/branch/other_file.md)
Example 2: git markdown relative link
[a relative link](README_2.md)
[a link] (https://github.com/user/repo/blob/branch/other_file.md)
[a relative link](README_2.md)