Add ExtendsClass JSON Storage (#1120)

README.md

@@ -278,6 +278,7 @@ API | Description | Auth | HTTPS | CORS |
 | [CountAPI](https://countapi.xyz) | Free and simple counting service. You can use it to track page hits and specific events | No | Yes | Yes |
 | [DigitalOcean Status](https://status.digitalocean.com/api) | Status of all DigitalOcean services | No | Yes | Unknown |
 | [DomainDb Info](https://api.domainsdb.info/) | Domain name search to find all domains containing particular words/phrases/etc | No | Yes | Unknown |
+| [ExtendsClass JSON Storage](https://extendsclass.com/json-storage.html) | A simple JSON store API | No | Yes | Yes |
 | [Form2Channel](https://form2channel.com/) | Send static html form submissions to Google Sheets, Email, Slack or Telegram | No | Yes | Yes |
 | [Genderize.io](https://genderize.io) | Estimates a gender from a first name | No | Yes | Yes |
 | [GETPing](https://www.getping.info) | Trigger an email notification with a simple GET request | `apiKey` | Yes | Unknown |