Adding workflow figure

README.rst

@@ -66,6 +66,11 @@ HOWTO 101
 
 In a nutshell -- ``heudiconv`` is given a file tree of DICOMs, and it produces a restructured file tree of NifTI files (conversion handled by `dcm2niix`_) with accompanying metadata files.
 The input and output structure is as flexible as your data, which is accomplished by using a Python file called a ``heuristic`` that knows how to read your input structure and decides how to name the resultant files.
+You can run your conversion automatically (which will produce a ``.heudiconv`` directory storing the used parameters), or generate the default parameters, edit them to customize file naming, and continue conversion via an additional invocation of `heudiconv`:
+
+.. image:: figs/workflow.png
+
+
 ``heudiconv`` comes with `existing heuristics <https://github.com/nipy/heudiconv/tree/master/heudiconv/heuristics>`_ which can be used as is, or as examples. 
 For instance, the Heuristic `convertall <https://github.com/nipy/heudiconv/blob/master/heudiconv/heuristics/convertall.py>`_ extracts standard metadata from all matching DICOMs.
 ``heudiconv`` creates mapping files, ``<something>.edit.text`` which lets researchers simply establish their own conversion mapping.