Added Python read me file.

Niflib for Python ReadMe.txt

+Python SWIG wrapper for Niflib
+
+To use:  Unzip the files to your Python folder (Probably C:\Python24).
+
+Due to the many API changes in this version of Niflib, the module is called "new_niflib" to
+give people using the existing Niflib for Python the ability to use both versions at the same time.
+The next major release will return to the name "niflib."
+
+From within Python:
+
+import new_niflib
+
+or
+
+from new_niflib import *
+