Add instructions for building with pip

Author: mdpiper

README.rst

@@ -5,17 +5,36 @@ pymt_heatf
 This is an example of building a model,
 written in Fortran and wrapped in Python with the `babelizer <https://github.com/csdms/babelizer>`_,
 with the `meson-python <https://meson-python.readthedocs.io/en/latest/>`_ build system
-using a ``pyproject.toml`` file to describe the build.
+using a *pyproject.toml* file to describe the build.
 
 Build/Install
 -------------
 
 This is a sketch of how to build and install this project.
 
-1. Create the conda environment from `environment.yml` and activate it
+With conda
+..........
+
+1. Create a conda environment from the *environment.yml* file and activate it
 2. Build/install the `Fortran BMI example <https://github.com/csdms/bmi-example-fortran/#buildinstall>`_
 3. Build/install this project with ``make install``
 
+With pip
+........
+
+Make, CMake, and a Fortran compiler are required.
+
+1. Create a virtual environment
+2. Build/install the `Fortran BMI specification <https://github.com/csdms/bmi-fortran/#buildinstall>`_ (it's not installable through ``pip``)
+3. Build/install the `Fortran BMI example <https://github.com/csdms/bmi-example-fortran/#buildinstall>`_
+4. Install the build system requirements through ``pip``:
+
+   .. code-block:: bash
+
+    $ pip install meson-python meson ninja cython numpy bmipy
+
+5. Build/install this project with ``make install``
+
 Use
 ---