Add README file

---

.
├── bin
│   ├── runmymath.bat
│   └── runmymath.py
├── MANIFEST.in
├── mymath
│   └── test
│       ├── __init__.py
│       ├── test_all.py
│       └── test_calc.py
├── README.rst
└── setup.py

examples/package/3/README.rst

mymath
------

Super awesome Python module to compute the sum of numbers.

To use:

    import mymath
    mymath.sum(1, 2, 3)

examples/package/3/MANIFEST.in

include README.rst