Andrey Mashenkov created IGNITE-15792: -----------------------------------------
Summary: Update README.md with Mappers explanation.
Key: IGNITE-15792
URL: https://issues.apache.org/jira/browse/IGNITE-15792
Project: Ignite
Issue Type: Sub-task
Reporter: Andrey Mashenkov
Update README.md with a short description of Mappers API.
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