Add scripts for building EDSL scripts

Exercises/exercise-6/.gitignore

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+*.txt

Exercises/exercise-6/build.sh

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+for shape in "shape1" "shape2" "shape3" "iShape" "disc50"
+do
+    pushd "${BASH_SOURCE%/*}" > /dev/null
+    ghc ./Shapes.hs -e "render 100 100 $shape"
+    mv shape.txt "$shape.txt"
+    popd > /dev/null
+done

Exercises/exercise-6/watch.sh

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+pushd "${BASH_SOURCE%/*}" > /dev/null
+
+nix-shell -p entr bash --run \
+  "ls *.hs | \
+   entr -rs ' \
+    ./build.sh
+   ' \
+  "
+
+popd > /dev/null