DOC: Create README.rst for the module

Author: mseng10

README.rst

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+MultipleImageIterator
+==============================
+
+.. image:: https://github.com/KitwareMedical/MultipleImageIterator/workflows/Build,%20test,%20package/badge.svg
+
+Overview
+--------
+
+An `ITK <http://itk.org>`_-based implementation of principal components analysis.
+
+For more information, see the `Insight Journal article <http://hdl.handle.net/10380/3455>`_::
+
+  Schaerer J.
+  A MultipleImageIterator for iterating over multiple images simultaneously
+  The Insight Journal. December, 2014.
+  http://hdl.handle.net/10380/3455
+  http://www.insight-journal.org/browse/publication/915
+
+Installation
+------------
+
+Since ITK 4.11.0, this module is available in the ITK source tree as a Remote
+module. To enable it, set::
+
+  Module_MultipleImageIterator:BOOL=ON
+
+in ITK's CMake build configuration.
+
+License
+-------
+
+This software is distributed under the Apache 2.0 license. Please see
+the *LICENSE* file for details.