Update README.md (#1206)

Add LFAI mailing lists.
Signed-off-by: Lutkin Wang <yamasite@qq.com>

README.md

@@ -69,6 +69,12 @@ We use [GitHub issues](https://github.com/milvus-io/milvus/issues) to track issu
 
 See our [community](https://github.com/milvus-io/community) repository to learn about our governance and access more community resources.
 
+## Mailing lists
+
+- [Milvus TSC](https://lists.lfai.foundation/g/milvus-tsc)
+- [Milvus Technical Discuss](https://lists.lfai.foundation/g/milvus-technical-discuss)
+- [Milvus Announce](https://lists.lfai.foundation/g/milvus-announce)
+
 ## Contributors
 
 Below is a list of Milvus contributors. We greatly appreciate your contributions!