Fixed #14762 - Add documention for ContentFile. Thanks jesh for the suggestion...

.. currentmodule:: django.core.files.images

Additional ``ImageField`` attributes

Additional ``ImageFile`` attributes

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.. class:: ImageFile(file_object)

        >>> car.photo.save('myphoto.jpg', contents, save=True)

    Note that the ``content`` argument must be an instance of

    :class:`File` or of a subclass of :class:`File`.

    :class:`File` or of a subclass of :class:`File` such as :class:`ContentFile`.

.. method:: File.delete([save=True])

    Remove the file from the model instance and delete the underlying file. The

    ``save`` argument works as above.

``ContentFile`` objects

-----------------------

.. class:: ContentFile(File)

A ``ContentFile`` is a File-like object that takes string content, rather

than an actual file::

    from django.core.files.base import ContentFile

    f1 = ContentFile("my string content")

    f2 = ContentFile(u"my unicode content encoded as UTF-8".encode('UTF-8'))