More descriptive docs for options

[samp6]

Have been using this and enjoying it. Think it would be helpful for the docs to mention how the options are to be used - took me a while to figure out that expires/maxAge do the same thing, and what exact types of inputs they want. Thanks!

[devhammed]

@samp6 Thanks you so much but I have been busy these days, you can actually help by improving the docs and send a pull request, I will review and merge.