README missing a step?

[glyn]

After several hours of fiddling, I am under the impression I need to install the package haskell-mode to get lsp-haskell to work. If this really is necessary, then it seems the README of this repo is missing this instruction. Happy to create a PR if so...

[yyoncho]

haskell-mode can be a dependency as well to avoid that kind of issues. Similarly, lsp-dart depends on dart-mode.

[yyoncho]

In case it is not clear, feel free to provide a PR :)

[glyn]

Since my elisp knowledge would fit on a postage stamp with room to spare, please take a look at this draft PR: #164.