First commit, hello world for swig.

Author: aaronchall

README.md

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+I already had gcc and related stuff, so that might be a dependency.
+
+after creating example.(i|c|h), I ran the following:
+
+``` bash
+sudo apt-get install swig                                                                                                                       
+swig -python example.i                                                                                                                          
+```
+
+Then created setup.py and ran that:
+ 
+``` bash
+python setup.py build_ext --inplace                                                                                                             
+```
+
+and then could import:
+
+``` python
+>>> import example
+>>> example.fact(4)
+24
+```

example.c

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+/* File: example.c */
+
+#include "example.h"
+
+int fact(int n) {
+  if (n<0){ /* This should propably return an error, but this is simpler*/
+    return 0;
+  }
+  if (n == 0) {
+    return 1;
+  }
+  else {
+    /* testing for overflow would be a good idea here */
+    return n * fact(n-1);
+  }
+}

example.h

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+/* File: example.h */
+
+int fact(int n);

example.i

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+/* File example.i */
+%module example
+
+%{
+#define SWIG_FILE_WITH_INIT
+#include "example.h"
+  %}
+
+int fact(int n);

setup.py

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+#!/usr/bin/env python
+
+"""
+setup.py file for SWIG example
+"""
+
+from distutils.core import setup, Extension
+
+
+example_module = Extension('_example',
+                           sources=['example_wrap.c', 'example.c'],
+                           )
+
+setup (name = 'example',
+       version = '0.1',
+       author      = "SWIG Docs",
+       description = """Simple swig example from docs""",
+       ext_modules = [example_module],
+       py_modules = ["example"],
+       )