[#40] Add Sphinx documentation

docs/Makefile

docs/make.bat

docs/source/conf.py

docs/source/development/index.rst

docs/source/index.rst

docs/source/logo.png

docs/source/reference/errors.rst

docs/source/reference/image.rst

docs/source/reference/index.rst

docs/source/reference/page.rst

docs/source/reference/site.rst

docs/source/user/connecting.rst

docs/source/user/index.rst

docs/source/user/page-ops.rst