Support for input files

[thawankeane]

Feature request

I was trying to use the library with a file type input, when I came across the submit response I saw that the value of the inputs return C:\fakepath\<filename>, which is not very useful. So I came to github to take a look at the source codes and noticed that something similar could be done with pr #9

I could send a pr if it is also allowed

Thanks for attention