Haskell walkthough

[imaginator]

From the website planning doc:

While I think rust-simplicity should get more attention, doing a quickstart guide for ghci is reasonable. We have some asciinema videos and an example module that we can use for this. They just need to be brought up to date.

Would be amazing if we could also embed some of the acscii cinema videos.

There's an empty page at https://github.com/BlockstreamResearch/simplicity-lang-org/edit/main/docs/getting-started/haskell.md