add a new README.txt and LICENSE.txt

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+The argparse module makes it easy to write user friendly command line
+interfaces.
+
+The program defines what arguments it requires, and argparse will figure out
+how to parse those out of sys.argv. The argparse module also automatically
+generates help and usage messages and issues errors when users give the
+program invalid arguments.
+
+As of Python >= 2.7, the argparse module is maintained within the Python
+standard library. For users who still need to support Python < 2.7, it is
+also provided as a separate package, which tries to stay compatible with the
+module in the standard library, but also supports older Python versions.
+
+argparse is licensed under the Python license, for details see LICENSE.txt.
+