I recently learned to use github, the following is the editor of the readme file.
first : new a repository, you can see the readme.md file.
second: Click it. On the right you can see a button like a pen, like this... and click it
And then: use the markdown Language edit what you want. Select the “commit changes” button（green button） at the bottom.
.............
last: I hope this is what you want
原文：http://www.cnblogs.com/xulinmei/p/7363177.html