docs: Add acknowledgment to README (GreptimeTeam#522)

* docs: Add acknowledgment to README * docs: Address review comment
dut3062796s · Nov 15, 2022 · 57979c9 · 57979c9
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diff --git a/README.md b/README.md
@@ -178,3 +178,9 @@ open contributions and allowing you to use the software however you want.
 ## Contributing
 
 Please refer to [contribution guidelines](CONTRIBUTING.md) for more information.
+
+## Acknowledgement
+- GreptimeDB uses [Apache Arrow](https://arrow.apache.org/) as the memory model and [Apache Parquet](https://parquet.apache.org/) as the persistent file format.
+- GreptimeDB's query engine is powered by [Apache Arrow DataFusion](https://github.com/apache/arrow-datafusion).
+- [OpenDAL](https://github.com/datafuselabs/opendal) from [Datafuse Labs](https://github.com/datafuselabs) gives GreptimeDB a very general and elegant data access abstraction layer.
+- GreptimeDB’s meta service is based on [etcd](https://etcd.io/).