Add Claude Code instructions (#1065)

Author: tonycosentini

docs/tools/mcp/setup.mdx

@@ -56,6 +56,13 @@ Add to your Visual Studio Code `mcp.json`:
 }
 ```
 
+### Using with Claude Code
+
+Add the server via the `claude` CLI command:
+```
+claude mcp add --transport http revenuecat https://mcp.revenuecat.ai/mcp --header "Authorization: Bearer YOUR_API_V2_SECRET_KEY"
+```
+
 ### Using with Claude Desktop
 
 Add to your Claude Desktop configuration:
@@ -127,4 +134,4 @@ The local extension provides additional VS Code commands for key management:
 | ------------------------------------------ | ------------------------------------- |
 | `RevenueCat: Set Project Secret Key`       | Set or update your API key            |
 | `RevenueCat: Remove Project Secret Key`    | Delete your stored API key            |
-| `RevenueCat: Show your project secret key` | Display your current API key (masked) |
+| `RevenueCat: Show your project secret key` | Display your current API key (masked) |