feat(third_party/bazel): Check in rules_haskell from Tweag

third_party/bazel/rules_haskell/docs/index.rst

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+.. meta::
+   :description: User guide for building Haskell code with Bazel.
+
+Build Haskell Using Bazel
+=========================
+
+Bazel_ is a tool for automating the *building* and the *testing* of
+software. Follow :ref:`this guide <guide>` to get started building
+small Haskell projects using Bazel. For a deeper dive and solutions to
+more advanced use cases, see :ref:`Common Haskell Build Use Cases
+<use-cases>`. Refer to the `Bazel documentation`_ for more about
+Bazel.
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   why-bazel
+   haskell
+   haskell-use-cases
+
+.. _Bazel: https://bazel.build
+.. _Bazel documentation: https://docs.bazel.build/versions/master/getting-started.html