Fixed #7850 -- Added adding django.contrib.admin to INSTALLED_APPS to the...

Overview

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There are four steps in activating the Django admin site:

There are five steps in activating the Django admin site:

    1. Determine which of your application's models should be editable in the

    1. Add ``django.contrib.admin`` to your ``INSTALLED_APPS`` setting.

    2. Determine which of your application's models should be editable in the

       admin interface.

    2. For each of those models, optionally create a ``ModelAdmin`` class that

    3. For each of those models, optionally create a ``ModelAdmin`` class that

       encapsulates the customized admin functionality and options for that

       particular model.

    3. Instantiate an ``AdminSite`` and tell it about each of your models and

    4. Instantiate an ``AdminSite`` and tell it about each of your models and

       ``ModelAdmin`` classes.

    4. Hook the ``AdminSite`` instance into your URLconf.

    5. Hook the ``AdminSite`` instance into your URLconf.

``ModelAdmin`` objects

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