Import Successes

[patricoferris]

Import the OCaml successes from https://github.com/ocaml/ocaml.org/blob/master/site/learn/success.md -- this should most likely be collections like the tutorials where the markdown body is an explanation, the meta data could look like:

type t = {
  title : string;
  description : string;
  company : string option; 
  tags : string list; (* Could be academic, industry etc. ? *)
}