Add most of the structure! plus several Base Layer docs

docs/base/config/logging.rst

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+
+.. highlight:: ini
+
+Configuring Logging
+===================
+
+Rattail relies on Python standard ``logging`` module to configure logging.
+However if :doc:`inheritance` is involved then Rattail will first combine all
+applicable config files into a single file before handing that off to
+`logging.config.fileConfig()`_.
+
+.. _logging.config.fileConfig(): https://docs.python.org/3/library/logging.config.html#logging.config.fileConfig
+
+Rattail does not do any of this though, unless config says to.  So if you want
+it to configure logging in this way, specify this in your config file::
+
+   [rattail.config]
+   configure_logging = true
+
+Beyond that you must ensure your config file(s) contains appropriate settings
+for logging.  Rattail `has a sample`_ ``rattail.conf`` which includes a typical
+logging section.  (This is the source used to generate a new file when you run
+``rattail make-config -T rattail`` command.)
+
+.. _has a sample: https://kallithea.rattailproject.org/rattail-project/rattail/files/master/rattail/data/config/rattail.conf
+
+See the Python docs for more info, in particular these sections:
+
+* `Configuration file format <https://docs.python.org/3/library/logging.config.html#logging-config-fileformat>`_
+* `Logging Levels <https://docs.python.org/3/howto/logging.html#logging-levels>`_
+* `Useful Handlers <https://docs.python.org/3/howto/logging.html#useful-handlers>`_
+* `Formatters <https://docs.python.org/3/howto/logging.html#formatters>`_