Revise README for ScalarDB MCP Server details (#1)

* Revise README for ScalarDB MCP Server details

Updated README to provide detailed information about ScalarDB MCP Server, its features, quickstart guide, and version compatibility.

* Add missing image

* Update README.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Remove duplicated link

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ypeckstadt

README.md

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-# Standard repository template
+# ScalarDB MCP Server
 
-The purpose of this repository template is to streamline the creation of commonly used files when we create new repositories.
+ScalarDB MCP Server is a [Model Context Protocol (MCP)](https://modelcontextprotocol.io/) implementation that enables LLMs to access and manage your data through ScalarDB. By leveraging LLMs, you can use natural language to search and update across multiple, potentially siloed, databases.
+
+## What is ScalarDB MCP Server?
+
+ScalarDB MCP Server works seamlessly whether you're using a single database or multiple databases. Unlike traditional approaches that require separate MCP servers for each database, ScalarDB MCP Server leverages the [multi-storage capabilities of ScalarDB](https://scalardb.scalar-labs.com/docs/latest/multi-storage-transactions) to provide unified access to heterogeneous databases (PostgreSQL, MySQL, Cosmos DB, DynamoDB, etc.) through a single MCP server. By simply submitting queries in natural language, the server automatically executes the appropriate operations across your databases, improving and accelerating decision-making processes.
+
+<img src="docs/images/architecture.png" alt="ScalarDB MCP Server Architecture" width="400">
+
+### Key features
+
+- **Works with single or multiple databases:** Whether you have one database or many databases managed by ScalarDB, ScalarDB MCP Server provides a unified natural language interface.
+- **AI-powered automation:** Use conversational queries—the LLM automatically generates and executes the appropriate database operations.
+- **ACID-compliant transactions:** Maintain data integrity with full transactional support across databases.
+- **Dual operational modes:** SQL mode for ScalarDB Cluster (leveraging the SQL interface) or CRUD mode for ScalarDB Community edition (by using ScalarDB Core).
+
+## Docs
+
+* **[Getting Started with ScalarDB MCP Server](https://scalardb.scalar-labs.com/docs/latest/scalardb-mcp-server/getting-started):** Installation and quickstart guide
+* **[ScalarDB MCP Server Tools Reference](https://scalardb.scalar-labs.com/docs/latest/scalardb-mcp-server/tools-reference):** Complete documentation of all available MCP tools
+
+## Quickstart
+
+Get started with ScalarDB MCP Server in three steps:
+
+1. **Install:** Download the Docker image or JAR file.
+2. **Configure:** Connect to your ScalarDB deployment and MCP client.
+3. **Use:** Start querying your databases by using natural language.
+
+For complete installation and setup instructions, see [Getting Started with ScalarDB MCP Server](https://scalardb.scalar-labs.com/docs/latest/scalardb-mcp-server/getting-started).
+
+**Example queries once configured:**
+
+- `Show me all users from the customer table`
+- `Create a new table called products with columns id, name, and price`
+- `Get user profile and order history for user ID 123`
+
+## ScalarDB version compatibility
+
+| ScalarDB MCP Server | ScalarDB Community | ScalarDB Cluster | Java Version |
+|---------------------|--------------------|------------------|--------------|
+| 0.9.x               | 3.16+              | 3.16+            | 17+          |
+
+**Note about operational mode:**
+- **ScalarDB Cluster:** Use SQL mode for efficient operations (recommended) or CRUD mode for granular control.
+- **ScalarDB Community edition:** Use CRUD mode only (SQL interface not available).
+
+### Reporting issues
+
+If you find a bug or have a feature request, please [open an issue](https://github.com/scalar-labs/scalardb-mcp-server/issues).
+
+## Community
+
+- **[ScalarDB Documentation](https://scalardb.scalar-labs.com/):** Learn more about ScalarDB.