Add note about the porting to README.md (#2135)

Since Koalas will be ported into Apache Spark, added note on `README.md` to notify this.
databricks · Apr 7, 2021 · 0fd088e · 0fd088e
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+**NOTE**: Koalas supports Apache Spark 3.1 and below as it will be [officially included to PySpark in the upcoming Apache Spark 3.2](http://apache-spark-developers-list.1001551.n3.nabble.com/VOTE-SPIP-Support-pandas-API-layer-on-PySpark-td30996.html). This repository is now in maintenance mode. For Apache Spark 3.2 and above, please use PySpark directly.
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 <p align="center">
   <img src="https://raw.githubusercontent.com/databricks/koalas/master/icons/koalas-logo.png" width="140"/>
 </p>