Add Retool (#375)

README.md

@@ -1635,6 +1635,7 @@
 | [Random Identity](https://rapidapi.com/edualc1018/api/random-identity-generator) | Random Identity Generator with custom response format | `apiKey` | Yes | Yes |
 | [Randommer](https://randommer.io/randommer-api) | Random data generator | `apiKey` | Yes | Yes |
 | [RandomUser](https://randomuser.me) | Generates and list user data | No | Yes | Unknown |
+| [Retool](https://retool.com/api) | Generate test data for your application | `apiKey` | Yes | Unknown |
 | [RoboHash](https://robohash.org/) | Generate random robot/alien avatars | No | Yes | Unknown |
 | [This Person Does not Exist](https://thispersondoesnotexist.com) | Generates real-life faces of people who do not exist | No | Yes | Unknown |
 | [UUID Generator](https://www.uuidtools.com/docs) | Generate UUIDs | No | Yes | No |