Add README

Author: lpsinger

README.md

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+[![codecov](https://codecov.io/gh/nasa-gcn/python-dynamodb-autoincrement/graph/badge.svg?token=ezsMkImff0)](https://codecov.io/gh/nasa-gcn/python-dynamodb-autoincrement)
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+# python-dynamodb-autoincrement
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+Use optimistic locking to put DynamoDB records with auto-incrementing attributes. This is a Python port of https://github.com/nasa-gcn/dynamodb-autoincrement. Inspired by:
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+- https://aws.amazon.com/blogs/aws/new-amazon-dynamodb-transactions/
+- https://bitesizedserverless.com/bite/reliable-auto-increments-in-dynamodb/