Add configuration loading + docs + linter fixes.

doc.go

@@ -0,0 +1,30 @@
+// Package kong aims to support arbitrarily complex command-line structures with as little developer effort as possible.
+//
+// Here's an example:
+//
+//     shell rm [-f] [-r] <paths> ...
+//     shell ls [<paths> ...]
+//
+// This can be represented by the following command-line structure:
+//
+//     package main
+//
+//     import "github.com/alecthomas/kong"
+//
+//     var CLI struct {
+//       Rm struct {
+//         Force     bool `short:"f" help:"Force removal."`
+//         Recursive bool `short:"r" help:"Recursively remove files."`
+//
+//         Paths []string `arg help:"Paths to remove." type:"path"`
+//       } `cmd help:"Remove files."`
+//
+//       Ls struct {
+//         Paths []string `arg optional help:"Paths to list." type:"path"`
+//       } `cmd help:"List paths."`
+//     }
+//
+//     func main() {
+//       kong.Parse(&CLI)
+//     }
+package kong