Doc for initial release

[prjemian]

Fill out the documentation sufficient for the initial release. Compare with the hklpy package.

hklpy documentation files:

• ./_static/e4c-config.json
• ./_static/e4c-config.yml
• ./_static/issue-155.ipynb
• ./api.rst
• ./calc.rst
• ./conf.py
• ./configuration.rst
• ./constraints.rst
• ./context.rst
• ./diffract.rst
• ./diffract.rst (energy controls, including k4cve in geometries.rst)
• ./engine.rst
• ./examples/diffractometer.rst
• ./examples/howto.rst
• ./examples/notebooks/geo_e4cv.ipynb
• ./examples/notebooks/geo_e6c.ipynb
• ./examples/notebooks/geo_k4cv.ipynb
• ./examples/notebooks/how_additional_parameters.ipynb
• ./examples/notebooks/how_configuration.ipynb
• ./examples/notebooks/how_extra_real_axis.ipynb
• ./examples/notebooks/how_spec_commands.rst
• ./examples/notebooks/README.md
• ./examples/notebooks/resources/3S+1D.png
• ./examples/notebooks/resources/4S+2D-labeled.png
• ./examples/notebooks/resources/4S+2D-photo.jpg
• ./examples/notebooks/resources/4S+2D.png
• ./examples/notebooks/resources/6-circle-schematic.png
• ./examples/notebooks/resources/img69.gif
• ./examples/notebooks/resources/k4cv.png
• ./examples/notebooks/resources/LNO_LAO_s14.dat
• ./examples/notebooks/tst_e4cv_fourc.ipynb
• ./examples/notebooks/tst_e6c_test_calculations.ipynb
• ./examples/notebooks/tst_UB_in_descriptor_document.ipynb
• ./examples/notebooks/tst_UB_in_stream.ipynb
• ./examples/notebooks/var_e4cv_renamed_axes.ipynb
• ./examples/notebooks/var_engines.ipynb
• ./examples/notebooks/var_nslsii_tardis.ipynb
• ./examples/t_and_c.rst
• ./examples/variations.rst
• ./geometries.rst
• ./geometry_tables.rst
• ./index.rst
• ./install.rst
• ./license.rst
• ./overview.rst
• ./ready_to_use.rst
• ./release_notes.rst
• ./sample.rst
• ./substitutions.txt
• ./user_guide.rst
• ./user.rst
• ./util.rst

[prjemian]

Consider Sphinx configuration that breaks each source code doc to its own page.

.. autosummary::
   :toctree: generated

[prjemian]

Prerequisite:

• Generalize pseudo and real position input #36