add notes on steps needed to be done to use PyPartMC from Matlab to README (#306)

Author: slayoo

README.md

@@ -164,6 +164,11 @@ print(aero_state.masses()'aero_state.num_concs, "# kg/m3")
 
 #### Matlab (using [Matlab's built-in Python interface](https://www.mathworks.com/help/matlab/python-language.html))
 
+notes (see the [PyPartMC Matlab CI workflow](https://github.com/open-atmos/PyPartMC/blob/main/.github/workflows/readme_listings.yml) for an example on how to achieve it on Ubuntu 20):
+- Matlab ships with convenience copies of C, C++ and Fortran runtime libraries which are `dlopened()` by default; one way to make PyPartMC OK with it is to [pip-]install by compiling from source using the very same version of GCC that Matlab borrowed these libraries from (e.g., [GCC 9 for Matlab R2022a, etc](https://www.mathworks.com/support/requirements/supported-compilers-linux.html));
+- Matlab needs to [use the same Python interpretter/venv](https://www.mathworks.com/support/requirements/python-compatibility.html) as the pip invocation used to install PyPartMC;
+- a single-line `pybind11_builtins.py` file with just `pybind11_type=type` inside needs to be placed within Matlab's `PYTHONPATH` to sort out a [Matlab-pybind11 incompatibility](https://github.com/pybind/pybind11/issues/3945). 
+
 ````Matlab
 ppmc = py.importlib.import_module('PyPartMC');
 si = py.importlib.import_module('PyPartMC').si;