Add an INSTALL.rst, along with some instructions for Mac

INSTALL.rst

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+Building Coriolis
+=================
+
+To build Coriolis, ensure the following prerequisites are met:
+
+* A C++11 compliant compiler.
+* Python 3.
+* make or ninja.
+* cmake.
+* bzip2
+* boost.
+* bison & flex.
+* Qt 5 & Qt 5 Svg.
+* Qwt
+* libxml2.
+* RapidJSON, http://rapidjson.org/ .
+* Eigen 3,  http://eigen.tuxfamily.org .
+* Lemon, http://lemon.cs.elte.hu/trac/lemon .
+* doxygen
+* pelican
+* latex
+
+The build system relies on a fixed directory tree from the root
+of the user currently building it. Thus first step is to get a clone of
+the repository in the right place. Proceed as follow:
+
+.. code-block:: bash
+
+   $ git clone --recurse-submodules https://github.com/lip6/coriolis
+   $ cd coriolis
+
+Then, to build Python wheels:
+
+.. code-block:: bash
+
+   $ poetry build
+
+The wheels can be found in dist and installed using pip:
+
+.. code-block:: bash
+
+   $ pip install dist/*.whl
+
+Building for Mac OSX
+====================
+
+To build on mac, first install _Homebrew: https://brew.sh
+
+To install the prereqisites:
+  
+.. code-block:: bash
+
+   brew install doxygen latex qt@5 qwt-qt5 rapidjson boost
+   brew install --cask mactex 
+
+.. code-block:: bash
+
+   CMAKE_FRAMEWORK_PATH=/opt/homebrew/opt/qt@5/lib/cmake/
+
+Using Coriolis
+==============
+
+Prior to using Coriolis, you need to setup your UNIX environment by running
+the following command:
+
+.. code-block:: bash
+
+    ego@home:~$ eval `~/coriolis-2.x/OS.DISTRIB/Release.Shared/install/etc/coriolis2/coriolisEnv.py`
+
+Then you can launch the GUI:
+
+.. code-block:: bash
+
+    ego@home:~$ cgt -V