chore: add venv.rst file

docs/source/venv.rst

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+After satisfying the dependencies above, create a virtual environment (venv) and install PyGObject:
+
+If you have ``uv`` as your Python version manager, invoke the following:
+
+.. code:: console
+
+    uv venv --python 3.13 $HOME/.virtualenvs/dzgui
+    source $HOME/.virtualenvs/dzgui/bin/activate
+    uv pip install PyGObject
+
+If you installed the ``python3.13`` package directly instead of ``uv``, use the below:
+
+.. code:: console
+
+   python3.13 -m venv $HOME/.virtualenvs/dzgui
+   source $HOME/.virtualenvs/dzgui/bin/activate
+   pip install PyGObject
+
+You can now proceed to the :ref:`Installscript`.
+After installation, refer to the additional remarks below.
+
+.. important::
+   Since PyGObject is localized to a venv, it is advisable to create a wrapper script to ensure
+   the venv is activated on subsequent invocations of DZGUI.
+
+.. code:: console
+
+    #!/usr/bin/env bash
+    source $HOME/.virtualenvs/dzgui/bin/activate
+    <insert your path to dzgui.sh>
+
+Make sure to update the placeholder path on the last line. For example, if you ran the
+installscript from your home directory, the wrapper script would look like:
+
+.. code:: console
+
+    #!/usr/bin/env bash
+    source $HOME/.virtualenvs/dzgui/bin/activate
+    $HOME/dzgui.sh
+
+Save this wrapper script in a location of your choice, e.g., ``mywrapper.sh`` and set the
+executable bit: ``chmod +x mywrapper.sh`` This script will be your entrypoint for
+future invocations of DZGUI, so you should launch it, not ``dzgui.sh``