Add a README file listing dependencies.

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+== Requirements
+
+The following Haskell packages are required to build the program and
+its documentation. Each of them may in turn have their own
+dependencies; you should probably just use a package manager to
+install them.
+
+  * Storable Complex
+      http://hackage.haskell.org/package/storable-complex
+
+  * hMatrix
+      http://perception.inf.um.es/hmatrix/
+
+  * hUnit
+      http://hunit.sourceforge.net/
+
+  * QuickCheck
+      http://hackage.haskell.org/package/QuickCheck
+
+  * HsColour
+      http://www.cs.york.ac.uk/fp/darcs/hscolour/
+
+  * Haddock
+      http://www.haskell.org/haddock/