add README

Author: kevinjqliu

getting-started/trino/README.md

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+
+# Getting Started with Trino and Apache Polaris
+
+This getting started guide provides a docker-compose file to set up [Trino](https://trino.io/) with Apache Polaris. Apache Polaris is configured as an Iceberg REST Catalog in Trino. 
+
+## Run the docker-compose file
+To start the docker-compose file, run this command from the repo's root directory:
+```
+docker-compose -f getting-started/trino/docker-compose-trino.yml up 
+```
+
+## Run Trino queries via Trino ClI
+To access the Trino CLI, run this command
+```
+docker exec -it trino-trino-1 trino
+```
+Note, `trino-trino-1` is the name docker container.
+
+Example Trino queries:
+```
+SHOW CATALOGS;
+SHOW SCHEMAS FROM iceberg;
+SHOW TABLES FROM iceberg.information_schema;
+DESCRIBE iceberg.information_schema.tables;
+
+CREATE SCHEMA iceberg.tpch;
+CREATE TABLE iceberg.tpch.test_polaris AS SELECT 1 x;
+SELECT * FROM iceberg.tpch.test_polaris;
+```
+
+## Note
+The polaris catalog setup script use the credential `principal:root;realm:default-realm`. This credential is used so users do not need to fetch credentials from Apache Polaris' console output.
+
+An example catalog is created in Apache Polaris using the `curl` command. See `create-polaris-catalog.sh` for details.