Update README.md

Author: lmangani

README.md

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 # ClickHouse NodeJS URL Engine
-This basic example illustrates a simple NodeJS URL Engine server for Clickhouse
+This basic example illustrates a simple NodeJS [URL Table Engine](https://clickhouse.com/docs/en/engines/table-engines/special/url/) server for Clickhouse
 
 #### Setup
 Install and run the example server