Merge pull request #325 from v-kessler/adding-iceberg

Add Apache Iceberg and REST Catalogs (Polaris & Lakekeeper) to Handbook

Author: EcZachly

README.md

@@ -59,6 +59,9 @@ Top must-join communities for ML:
   - [Delta Lake](https://delta.io/)
   - [Ilum](https://ilum.cloud/)
   - [DuckLake](https://ducklake.select/)
+  - [Apache Iceberg](https://iceberg.apache.org/)
+  - [Apache Polaris](https://polaris.apache.org/)
+  - [Lakekeeper](https://lakekeeper.io/)
 - Data Warehouse
   - [Snowflake](https://www.snowflake.com/en/)
   - [Firebolt](https://www.firebolt.io/)