Haskell translation

The description previously only had Python-specific code blocks. As there's a C++ translation, I'm not sure how the addition of Haskell-specific code blocks would affect the description there.

The description did not describe at all what transparency operation actually do: it replaces every pixel that did not change between two frames to the "transparent" palette.

Notably, it removes the possibility of removing only some of these pixels to achieve a better compression.

Expected and actual values are flipped in the tests.

You should specify the bound on the number of stones in the initial configuration.

Some suggestions:

• tests should generate more inputs with contiguous stones at the beginning (see B4B comment below)
• the description should give a rough idea about the characteristics of the tests (see B4B comment below)
• add the performance tag and perf criteria in the description

Not too sure about the purpose of the large tests in python.
My algorithm was pretty naive and I didn't do anything fancy but still passed.
Maybe just have small tests or really ramp it up.
To that end mine took like 5 seconds to just complie the test code so that should be sped up too.