[BEAM-2471]EMR DynamoDB example using HadoopIputFormatIO

[seshadri-cr]

This effort is to document an example to read from Amazon EMR DynamoDB using HadoopInputFormatIO.
Please let me know if any additional details are required.
JIRA - https://issues.apache.org/jira/browse/BEAM-2471

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[seshadri-cr]

R: @iemejia

[iemejia]

LGTM, I will fix some minor issues and merge.

[iemejia]

Thanks a lot for your contribution @seshadri-cr. Great job!