Add documentation for new lightdash sql CLI command (#370)

* Update references/lightdash-cli.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

* Update references/lightdash-cli.mdx

Co-Authored-By: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

---------

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: owlas

references/lightdash-cli.mdx

@@ -108,6 +108,7 @@ For examples and command-specific options, click through the command in the tabl
 |[`lightdash upload`](/references/lightdash-cli#lightdash-upload)                         | Upload charts and dashboards as code to your Lightdash project                     |
 |[`lightdash rename`](/references/lightdash-cli#lightdash-rename)                         | Rename model or field names across all your Lightdash content                      |
 |[`lightdash diagnostics`](/references/lightdash-cli#lightdash-diagnostics)               | Show diagnostic information about the CLI environment                              |
+|[`lightdash sql`](/references/lightdash-cli#lightdash-sql)                               | Run raw SQL query against the warehouse using project credentials                  |
 ---
 
 ### `lightdash login`
@@ -754,6 +755,54 @@ Show diagnostic information with dbt debug for a specific project directory:
 lightdash diagnostics --dbt --project-dir ./my-dbt-project
 ```
 
+### `lightdash sql`
+
+Run a raw SQL query against your data warehouse using the credentials from your currently selected project. Results are exported to a CSV file.
+
+```console
+lightdash sql <query> -o <output_file>
+```
+
+**Required argument:**
+
+- `<query>`
+  - The SQL query to execute
+
+**Required option:**
+
+- `-o, --output <file>`
+  - Output file path for CSV results
+
+**Options:**
+
+- `--limit <number>`
+  - Maximum number of rows to return from the query
+- `--page-size <number>`
+  - Number of rows per page (default: 500, max: 5000)
+- `--verbose`
+  - (default: false)
+  - Show detailed output
+
+**Examples:**
+
+Run a simple query and save results to a CSV file:
+
+```bash
+lightdash sql "SELECT * FROM users LIMIT 100" -o users.csv
+```
+
+Run a query with a row limit:
+
+```bash
+lightdash sql "SELECT * FROM orders" -o orders.csv --limit 1000
+```
+
+Run a query with verbose output to see detailed progress:
+
+```bash
+lightdash sql "SELECT customer_id, SUM(amount) FROM orders GROUP BY 1" -o revenue.csv --verbose
+```
+
 ---
 
 ## dbt options