If you pick a stackage release that has all the packages you need, it's as simple as adding the package to your dependencies in the cabal file. If your stackag

If you pick a stackage release that has all the packages you need, it's as simple as adding the package to your dependencies in the cabal file. If your stackage release doesn't have the package you need, you also need to add it to `extra-deps` in stack.yaml.