fix: add docs, tests; tweak some handler method signatures

docs/index.rst

@@ -0,0 +1,28 @@
+
+Wutta-COREPOS
+=============
+
+This package adds basic integration with `CORE-POS`_, using
+`pyCOREPOS`_.
+
+Its main purpose is to setup DB connections for CORE Office.
+
+.. _CORE-POS: https://www.core-pos.com/
+
+.. _pyCOREPOS: https://pypi.org/project/pyCOREPOS/
+
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Documentation
+
+   narr/install
+
+.. toctree::
+   :maxdepth: 1
+   :caption: API
+
+   api/wutta_corepos
+   api/wutta_corepos.app
+   api/wutta_corepos.conf
+   api/wutta_corepos.handler