Add stack instructions

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+# Haskell builds
+
+## Init
+
+    stack new project-name # creates project-name/
+    stack setup # installs ghc etc. to ~/.stack/
+    stack build # builds project-name-exe in .stack-work/
+
+## Directory Structure
+
+### app
+
+Sources directly related to executables
+
+### src
+
+Logic?
+
+### Package related stuff
+
+* project-name.cabal - auto-generated by `stack build`.
+* Setup.hs - part of Cabal. By default just boilerplate.
+* stack.yaml - project settings.
+* package.yaml - package config
+
+## Dependencies
+
+Add to package.yaml, and potentially to extra-deps in stack.yaml if not included
+by resolver package set.