Add a few notes for Haskell.

hs/README.md

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# Playing with Haskell
* my first functional language
* was familar with Ruby's blocks before starting out with Haskell
* sadly, I don't know how I got in touch (but probably my old harddisk
  has a few clues...)
* learnt most things with [Learn You a Haskell][lyah] (2011)
* got in touch again in university (3rd semester), "new things" were
  more formal understanding (2012)
* Monads have evaded me so far, but I hope to become more familar with
  them (see [HelloMonads](./HelloMonads.hs) for that)
## Required reading
* [Learn You a Haskell][lyah]
* [Hoogle](http://haskell.org/hoogle)
## Notes
* my favourite things written in Haskell are:
    - [Pandoc](http://johnmacfarlane.net): a versatile document
      converter (mostly used for markdown, but also for html email
      viewing)
    - [XMonad](http://xmonad.org): A tiling window manager, plan to use
      it again. Is on the list of "programs to read".
[lyah]: http://learnyouahaskell.com