Here's a [Github article](https://help.github.com/articles/open-source-licensing). You can automate it with [this third-party site](http://www.addalicense.com/) or [here's the MIT template](http://choosealicense.com/licenses/mit/) that you can paste into LICENSE.txt.
Here's a Github article. You can automate it with this third-party site or here's the MIT template that you can paste into LICENSE.txt.