Add Codex (#2531)

README.md

@@ -424,6 +424,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Changelogs.md](https://changelogs.md) | Structured changelog metadata from open source projects | No | Yes | Unknown |
 | [Ciprand](https://github.com/polarspetroll/ciprand) | Secure random string generator | No | Yes | No |
 | [Cloudflare Trace](https://github.com/fawazahmed0/cloudflare-trace-api) | Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More | No | Yes | Yes |
+| [Codex](https://github.com/Jaagrav/CodeX) | Online Compiler for Various Languages | No | Yes | Unknown |
 | [Contentful Images](https://www.contentful.com/developers/docs/references/images-api/) | Used to retrieve and apply transformations to images | `apiKey` | Yes | Yes |
 | [CORS Proxy](https://github.com/burhanuday/cors-proxy) | Get around the dreaded CORS error by using this proxy as a middle man | No | Yes | Yes |
 | [CountAPI](https://countapi.xyz) | Free and simple counting service. You can use it to track page hits and specific events | No | Yes | Yes |