Merge pull request public-apis#5986 from simul813/add-kdp-intelligence-api

Add KDP Intelligence API

Author: ArindamOSS

README.md

@@ -260,6 +260,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Google Books](https://developers.google.com/books/) | Books | `OAuth` | Yes | Unknown |
 | [GurbaniNow](https://github.com/GurbaniNow/api) | Fast and Accurate Gurbani RESTful API | No | Yes | Unknown |
 | [Gutendex](https://gutendex.com/) | Web-API for fetching data from Project Gutenberg Books Library | No | Yes | Unknown |
+| [KDP Intelligence](https://kdp-intelligence-api.vercel.app/docs) | KDP niche demand scores, competition analysis and revenue estimates | No | Yes | Yes |
 | [Open Library](https://openlibrary.org/developers/api) | Books, book covers and related data | No | Yes | No |
 | [Penguin Publishing](http://www.penguinrandomhouse.biz/webservices/rest/) | Books, book covers and related data | No | Yes | Yes |
 | [PoetryDB](https://github.com/thundercomb/poetrydb#readme) | Enables you to get instant data from our vast poetry collection | No | Yes | Yes |