Add README

Author: gjbex

source-code/interfaciing-c-c++-fortran/Pybind11/Stats/README.md

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+# Statistics
+
+Illustration of how to use numpy arrays in pybind11.
+
+
+## What is it?
+
+1. `src/statistics/statistics.h`: declaration of a (simple) statistics
+   analysis class.
+1. `src/statistics/statistics.cpp`: definition of class methods.
+1. `src/statistics/CMakeLists.txt`: CMake file to build a shared object.
+1. `src/bindings/statistics_bind.cpp`: definition of the pybind11
+   wrapper code.
+1. `src/bindings/CMakeLists.txt`: CMake file to build the shared object
+   that provides the Python module.
+1. `CMakeLists.txt`: CMake file to build the extension.
+1. `test.py`: Python scripts that uses the module.