Add narrative docs for app configuration

docs/narr/install/index.rst

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+
+Installation
+============
+
+Read on for setup instructions etc.
+
+.. toctree::
+   :maxdepth: 2
+
+   quickstart

docs/narr/install/quickstart.rst

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+
+Quick Start
+===========
+
+Install with:
+
+.. code-block:: sh
+
+   pip install wuttjamaican
+
+Create a config file, e.g. ``my.conf``:
+
+.. code-block:: ini
+
+   [foo]
+   bar = A
+   baz = 2
+   feature = true
+   words = the quick brown fox
+
+In your app, load the config and reference its values as needed::
+
+   from wuttjamaican.conf import make_config
+
+   config = make_config('/path/to/my.conf')
+
+   # this call..                        ..returns this value
+
+   config.get('foo.bar')                # 'A'
+
+   config.get('foo.baz')                # '2'
+   config.get_int('foo.baz')            # 2
+
+   config.get('foo.feature')            # 'true'
+   config.get_bool('foo.feature')       # True
+
+   config.get('foo.words')              # 'the quick brown fox'
+   config.get_list('foo.words')         # ['the', 'quick', 'brown', 'fox']
+
+For more info see:
+
+* :func:`~wuttjamaican.conf.make_config()`
+* :class:`~wuttjamaican.conf.WuttaConfig` and especially
+  :meth:`~wuttjamaican.conf.WuttaConfig.get()`
+
+You can also define your own command line interface; see:
+
+* :class:`~wuttjamaican.commands.base.Command`
+* :class:`~wuttjamaican.commands.base.Subcommand`