Added documentation on setting up pyenv and local venv

Author: Purg

.python-version

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+3.10.12

docs/index.rst

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    algorithms/index
    system/index
+   local_python_env
    python_tpl
 
 

docs/local_python_env.rst

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+=====================================
+Setting up a Local Python Environment
+=====================================
+
+Setting up ``pyenv``
+====================
+``pyenv`` is a tool to locally install various python versions separably
+GitHub page is `here <https://github.com/pyenv/pyenv>`_ which includes
+reference to the automatic installer script in `this section
+<https://github.com/pyenv/pyenv#automatic-installer>`_.
+The script that is downloaded and run can be viewed by following the links in
+your browser if you would like to vet what is to be run on your system (a
+recommended practice).
+
+The following are additional packages to install on your host system to enable
+building a fully capable Python installation.
+The package names are in the form that would be found via the Ubuntu package
+manager.
+
+* ``libbz2-dev``
+
+* ``libreadline-dev``
+
+* ``tk-dev``
+
+Creating Poetry-based Environment
+=================================
+A ``.python-version`` is present in the root of this repository that specifies
+the python version that should be run by ``pyenv`` shims when within this
+project's repository.
+This version should be installed with ``pyenv`` so that we can install our
+python dependencies locally in the next step.
+Navigate to the root of this repository and run:
+
+.. prompt::
+
+   pyenv install $(cat .python-version)
+
+With the python version successfully installed and available via ``pyenv``, we
+can now create our python virtualenv via Poetry:
+
+.. prompt::
+
+   poetry install