docs: Update README.md (#5)

* docs: Update README.md

* Update README.md

Author: averikitsch

README.md

@@ -1,7 +1,12 @@
 # Gemini CLI Extension - PostgreSQL
 
+> [!NOTE]
+> This extension is currently in beta, and may see breaking changes until the first stable release (v1.0).
+
 This Gemini CLI extension provides a set of tools to interact with [PostgreSQL](https://www.postgresql.org/docs/) instances. It allows you to manage your databases, execute queries, and explore schemas directly from the [Gemini CLI](https://google-gemini.github.io/gemini-cli/), using natural language prompts.
 
+Learn more about [Gemini CLI Extensions](https://github.com/google-gemini/gemini-cli/blob/main/docs/extension.md).
+
 ## Why Use the Postgres Extension?
 
 *   **Natural Language Management:** Stop wrestling with complex commands. Explore schemas and query data by describing what you want in plain English.
@@ -12,7 +17,7 @@ This Gemini CLI extension provides a set of tools to interact with [PostgreSQL](
 
 Before you begin, ensure you have the following:
 
-*   [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed.
+*   [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed with version +v0.6.0.
 *   A running PostgreSQL instance.
 *   User are granted database-level permissions to execute queries.