Add text for task 2
Formatting changes

* Code blocks weren't formatted right if in
lists.
* Code blocks need empty line before that.
* Add more backticks, it's much prettier this way.
Add empty solution.clj
We simplified and lazy seas are only numbers now
Fix typo
Add the first few sample test cases
We need empty lines before lists
Add more helper functions
Take lazy seqs out of the numbers defintion

They may be infinite and their average will be very
hard to compute.
Better formatting

It doesn't make sense to have one item alone on a
line and all the other on the second.
Change sort order to match the example
Clarify what can be in a player
Add the last two tests