Add remaining haskell book exercises

Haskell-book/14/addition/addition.cabal

@@ -0,0 +1,17 @@
+name:                addition
+version:             0.1.0.0
+license-file:        LICENSE
+author:              Chicken Little
+maintainer:          sky@isfalling.org
+category:            Text
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Addition
+  ghc-options:         -Wall -fwarn-tabs
+  build-depends:       base >= 4.7 && < 5
+                     , hspec
+                     , QuickCheck
+  hs-source-dirs:      .
+  default-language:    Haskell2010