Add OpenGraphr (#2824)

README.md

@@ -525,6 +525,7 @@ API | Description | Auth | HTTPS | CORS |
 | [OneSignal](https://documentation.onesignal.com/docs/onesignal-api) | Self-serve customer engagement solution for Push Notifications, Email, SMS & In-App | `apiKey` | Yes | Unknown |
 | [OOPSpam](https://oopspam.com/) | Multiple spam filtering service | No | Yes | Yes |
 | [Open Page Rank](https://www.domcop.com/openpagerank/) | API for calculating and comparing metrics of different websites using Page Rank algorithm | `apiKey` | Yes | Unknown |
+| [OpenGraphr](https://opengraphr.com/docs/1.0/overview) | Really simple API to retrieve Open Graph data from an URL | `apiKey` | Yes | Unknown |
 | [PageCDN](https://pagecdn.com/docs/public-api) | Public API for javascript, css and font libraries on PageCDN | `apiKey` | Yes | Yes |
 | [Plino](https://plino.herokuapp.com/) | An intelligent spam filtering system | No | Yes | No |
 | [Postman](https://docs.api.getpostman.com/) | Tool for testing APIs | `apiKey` | Yes | Unknown |