update docs to reflect editable install instructions

Author: ewu63

doc/contribute.rst

@@ -8,6 +8,20 @@ If you have an issue with pyOptSparse, a bug to report, or a feature to request,
 This lets other users know about the issue.
 If you are comfortable fixing the issue, please do so and submit a pull request.
 
+Editable Installs
+-----------------
+Due to the use of ``meson-python`` as the backend, the typical process of using ``pip install -e .`` to generate an editable install cannot be used.
+Instead, based on the instructions `here <https://mesonbuild.com/meson-python/how-to-guides/editable-installs.html#editable-installs>`__,
+you must first install the `build dependencies` yourself.
+This can be done by looking at the ``requires`` field of the ``[build-system]`` section of the ``pyproject.toml`` file.
+Then, do the following:
+
+.. prompt:: bash
+
+    pip install --no-build-isolation --editable .
+
+To run tests, ensure that the testing dependencies specified in the ``pyproject.toml`` file are also installed.
+
 Coding style
 ------------
 We use `ruff <https://github.com/astral-sh/ruff>`_ and `pre-commit <https://github.com/pre-commit/pre-commit/>`_ for linting and formatting.