link to docs and short description in readme.md

Author: tonyday567

readme.md

@@ -21,15 +21,9 @@ libraries
 
 [vector](http://www.datahaskell.org/docs/library/vector.html) is an efficient implementation of Int-indexed arrays (both mutable and immutable), with a powerful loop optimisation framework.
 
+[hmatrix](http://www.datahaskell.org/docs/library/hmatrix.html) is a linear algebra and matrix library, using the Data.Vector.Storable instance in the vector package under the hood.
 
 examples
 ---
 
 See [examples.hs](examples/examples.hs)
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-
-todo
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-- mwc-random
-- mwc-probability