Added the fcm mcp tools to the list (#8568)

Author: gsiddh

src/mcp/README.md

@@ -55,3 +55,5 @@ In `.cursor/mcp.json` in your workspace directory, add the Firebase MCP server:
 | `dataconnect_get_schema`         | `dataconnect` | List the Firebase Data Connect Schema in the project, which includes Cloud SQL data sources and the GraphQL Schema describing what tables are available.                                                       |
 | `dataconnect_get_connector`      | `dataconnect` | Get the Firebase Data Connect Connectors in the project, which includes the pre-defined GraphQL queries accessible to client SDKs.                                                                             |
 | `storage_get_rules`              | `storage`     | Retrieves the Firebase Cloud Storage Rules for the default bucket.                                                                                                                                             |
+| `send_message_to_fcm_token`      | `messaging`   | Sends a push message to an FCM Token.                                                                                                                                                                          |
+| `send_message_to_fcm_topic`      | `messaging`   | Sends a push message to an FCM Topic.                                                                                                                                                                          |