Add HTTP examples for POST PUT DELETE

[iwa]

hi!

thanks a lot for your great lib

one thing really missing tho is more examples to help newbies using your lib, so i've added a few really basic ones to at least show how to use Post, Put & Delete
examples are made about a little local Todo api, nothing extravagant

let me know if something isn't right for y'all!

[glbrntt]

Thanks for opening this by the way, more examples are great!