Add remaining haskell book exercises

Haskell-book/19/shawty/package.yaml

@@ -0,0 +1,31 @@
+name:                shawty
+version:             0.1.0.0
+homepage:            http://github.com
+license:             BSD3
+author:              Chris Allen
+maintainer:          cma@bitemyapp.com
+copyright:           2015, Chris Allen
+build-type:          Simple
+
+synopsis:            URI shortener
+category:            Web
+description:         Please see README.md
+
+dependencies:
+- base >= 4.7 && < 5
+- bytestring
+- hedis
+- mtl
+- network-uri
+- random
+- scotty
+- semigroups
+- text
+- transformers
+
+executables:
+  shawty:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded