add a readme

neural_programmer/README.md

+Implementation of the Neural Programmer model described in https://openreview.net/pdf?id=ry2YOrcge
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+Download the data from http://www-nlp.stanford.edu/software/sempre/wikitable/ Change the data_dir FLAG to the location of the data
+
+Training: python neural_programmer.py
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+The models are written to FLAGS.output_dir
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+Testing: python neural_programmer.py --evaluator_job=True
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+The models are loaded from FLAGS.output_dir. The evaluation is done on development data.
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+Maintained by Arvind Neelakantan (arvind2505)