Update README.md

Author: jasonbosco

README.md

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 # typesense-java
-Java client for Typesense | Work in Progress and Contributors Wanted!
+Java client for Typesense | Work in Progress and Help Wanted
+
+If you'd like to contribute, please join our [Slack Community](https://join.slack.com/t/typesense-community/shared_invite/zt-mx4nbsbn-AuOL89O7iBtvkz136egSJg) and say hello!