Handling the -F option of Curl about curl-to-go

[mholt]

Here are the docs for curl -F: https://curl.haxx.se/docs/manpage.html#-F

This is not a simple one. :) However, it's ok to partially implement a flag as long as we make it clear what features or forms/syntaxes are supported.

What we need to do is make a POST request with multipart/form-data body in Go; here's a good starting point: https://www.google.com/search?q=golang+http+post+multipart%2Fform-data

You'll probably want to become familiar with how multipart uploads work, if you aren't already, and then there's a great package in the standard library that makes it pretty easy: https://golang.org/pkg/mime/multipart/

Here's a really simple example from the search results that shows the most basic use, I think: https://gist.github.com/andrewmilson/19185aab2347f6ad29f5

Hopefully that is helpful in giving you a good starting point!