added shell script to do the setup for you

setup.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+if [ -a elm-starter-kit ]
+    then
+        echo "Looks like you've already run this."
+        echo "\`rm -rf elm-start-kit\` and try again."
+        exit 1
+fi
+
+mkdir elm-starter-kit
+cd elm-starter-kit
+
+git clone git@github.com:elm-lang/Elm.git
+git clone git@github.com:elm-lang/elm-reactor.git
+git clone git@github.com:michaelbjames/elm-reactor-starter.git
+
+
+status=0
+
+cd elm
+echo "Installing elm in the sandbox"
+cabal sandbox init
+status=$(($?+$status))
+if [ $status -gt 0 ]
+    then
+        echo "\`cabal sandbox init\` failed, do you have cabal?"
+        exit $status
+fi
+
+cabal install -j --only-dependencies && cabal configure && cabal build && cabal install
+status=$(($?+$status))
+if [ $status -gt 0 ]
+    then
+        echo "Installing elm failed, please email the list with the error!"
+        exit $status
+fi
+
+cd ../elm-reactor
+echo "Installing elm-reactor in a sandbox"
+cabal sandbox init
+cabal sandbox add-source ../elm
+cabal install -j --only-dependencies && cabal configure && cabal build && cabal install
+
+status=$(($?+$status))
+if [ $status -gt 0 ]
+    then
+        echo "Installing elm-reactor failed, please email the list with the error!"
+        exit $status
+fi
+
+cd ../elm-reactor-starter/todo
+elm --make --only-js Todo.elm
+cd ..
+
+echo "Setup complete."
+echo "Navigate to elm-reactor-starter and run:"
+echo "../elm-reactor/dist/build/elm-reactor/elm-reactor"