idris-modules: Add docs

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+Idris packages
+==============
+
+This directory contains build rules for idris packages. In addition,
+it contains several functions to build and compose those packages.
+Everything is exposed to the user via the `idrisPackages` attribute.
+
+callPackage
+------------
+
+This is like the normal nixpkgs callPackage function, specialized to
+idris packages.
+
+builtins
+---------
+
+This is a list of all of the libraries that come packaged with Idris
+itself.
+
+build-idris-package
+--------------------
+
+A function to build an idris package. Its sole argument is a set like
+you might pass to `stdenv.mkDerivation`, except `build-idris-package`
+sets several attributes for you. See `build-idris-package.nix` for
+details.
+
+build-builtin-package
+----------------------
+
+A version of `build-idris-package` specialized to builtin libraries.
+Mostly for internal use.
+
+with-packages
+-------------
+
+Bundle idris together with a list of packages. Because idris currently
+only supports a single directory in its library path, you must include
+all desired libraries here, including `prelude` and `base`.
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