Add more install docs

docs/narr/install/venv.rst

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+
+Virtual Environment
+===================
+
+Regardless of platform, you are strongly encouraged to use a
+:term:`virtual environment` for your :term:`app`.  This allows you to
+experiment with installation without affecting the rest of your
+system.
+
+See also the upstream definition for :term:`packaging:Virtual
+Environment`.
+
+
+Choosing a Location
+-------------------
+
+It can be helpful to standardize the location of all your virtual
+environments regardless of their purpose.  The tool you use to create
+a virtual environment may or may not have opinions on where that
+should be.
+
+WuttJamaican should not assume anything as far as where the virtual
+environments live.  But if you have no preference you might consider:
+
+* Linux - ``/srv/envs``
+* Windows - ``C:\envs``
+
+So for instance if you run Linux and make a new virtual environment
+named ``poser`` then it would live in ``/srv/envs/poser`` according to
+the above.
+
+
+Creating a Virtual Environment
+------------------------------
+
+For our purposes, on Linux you can do this:
+
+.. code-block:: sh
+
+   python3 -m venv /srv/envs/poser
+
+Please also see
+:doc:`packaging:guides/installing-using-pip-and-virtual-environments`
+in upstream docs.