minor #86 bootstrapping Workflow component docs (weaverryan)

This PR was merged into the master branch.

Discussion
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bootstrapping Workflow component docs

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84ac92d bootstrapping workflow docs

Author: javiereguiluz

components/workflow.rst

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+.. index::
+   single: Workflow
+   single: Components; Workflow
+
+The Workflow Component
+======================
+
+    The Workflow component provides tools for managing a workflow or, finite state
+    machine.
+
+Installation
+------------
+
+You can install the component in 2 different ways:
+
+* :doc:`Install it via Composer </components/using_components>` (``symfony/workflow`` on `Packagist`_);
+* Use the official Git repository (https://github.com/symfony/workflow).
+
+For more information, see the code in the Git Repository.