Add Slack information as a way to contact oneDPL developers.

README.md

@@ -37,7 +37,10 @@ You can find oneDPL samples at the [oneDPL Samples](https://github.com/oneapi-sr
 ## Support and Contribution
 Please report issues and suggestions via [GitHub issues](https://github.com/oneapi-src/oneDPL/issues).
 
+You can also contact oneDPL developers via [UXL Foundation Slack](https://slack-invite.uxlfoundation.org/) using
+the [#onedpl](https://uxlfoundation.slack.com/channels/onedpl) channel.
+
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 Intel and the Intel logo are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.
 
-\* Other names and brands may be claimed as the property of others.
+\* Other names and brands may be claimed as the property of others.