Loading the V2 code as a separate project to allow them to coexist.

Author: Paultagoras

jdbc-v2/README.md

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+# ClickHouse JDBC driver
+The official JDBC driver for ClickHouse
+## Documentation
+See the [ClickHouse website](https://clickhouse.com/docs/en/integrations/language-clients/java/jdbc) for the full documentation entry.
+
+## Examples
+For more example please check [here](https://github.com/ClickHouse/clickhouse-java/tree/main/examples/jdbc).