Add configuration notes to README.md (#964)

* Add configuration notes to README.md

Co-authored-by: Honah J. <[email protected]>

Author: dimas-b

README.md

@@ -96,6 +96,14 @@ using different configurations. Check the `./getting-started` directory for more
 - `kubectl get deployment -n polaris` - To check the status of the deployment.
 - `kubectl describe deployment polaris-deployment -n polaris` - To troubleshoot if things aren't working as expected.
 
+#### Configuring Polaris
+
+Polaris Servers can be configured using a variety of ways.
+Please see the [Configuration Guide](site/content/in-dev/unreleased/configuration.md)
+for more information.
+
+Default configuration values can be found in `quarkus/defaults/src/main/resources/application.properties`.
+
 #### Building docs
 
 - Docs are generated using [Hugo](https://gohugo.io/) using the [Docsy](https://www.docsy.dev/docs/) theme.

site/content/in-dev/unreleased/configuration.md

@@ -77,6 +77,12 @@ read-only mode, as Polaris only reads the configuration file once, at startup.
 
 ## Polaris Configuration Options Reference
 
+Most common configuration settings that users may want to change are:
+- `polaris.persistence.type` (see the [Configuring Apache Polaris for Production]({{% ref "configuring-polaris-for-production.md" %}})
+  guide for specific instructions).
+- `polaris.features.defaults.SUPPORTED_CATALOG_STORAGE_TYPES=["S3","GCS","AZURE"]`.
+   - Note: this excludes the default `FILE` storage type, which is not meaningful in a distributed deployment.
+
 The following configuration options are available for Polaris:
 
 TODO