Added example in the README

with other processes on the same computer.  It uses posix shared

memory internally and therefore should work on most operating systems.

Usage

-----

Example

-------

	import numpy as np

	import SharedArray as sa

	a = sa.create("test1", 10)

	b = sa.attach("test1")

	a[0] = 42

	print(b[0])

	del a

	print(b[0])

	sa.delete("test1")

	print(b[0])

Functions

---------

### `SharedArray.create(name, shape, dtype=float)`

------------

The extension uses the `distutils` python package that should be

familiar to most python users.

familiar to most python users. To test the extension directly from the

source tree, without installing, type:

	python setup.py build_ext --inplace

* To test the extension directly from the source tree, without

installing, type `python setup.py build_ext --inplace`.  You can then

start python or ipython from the same directory and `import

SharedArray`.

To build and install the extension system-wide, type:

* To build and install the extension, type `python setup.py build`

followed by `sudo python setup.py install`.

	python setup.py build

	sudo python setup.py install