Added Dungeons and Dragons API (#1031)

README.md

@@ -374,6 +374,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Deck of Cards](http://deckofcardsapi.com/) | Deck of Cards | No | No | Unknown |
 | [Destiny The Game](https://github.com/Bungie-net/api) | Bungie Platform API | `apiKey` | Yes | Unknown |
 | [Dota 2](https://docs.opendota.com/) | Provides information about Player stats , Match stats, Rankings for Dota 2 | No | Yes | Unknown |
+| [Dungeons and Dragons](http://www.dnd5eapi.co/) | Reference for 5th edition spells, classes, monsters, and more | No | No | No |
 | [Eve Online](https://esi.evetech.net/ui) | Third-Party Developer Documentation | `OAuth` | Yes | Unknown |
 | [Fortnite](https://fortniteapi.com/) | Fortnite Stats & Cosmetics | `apiKey` | Yes | Yes |
 | [Fortnite](https://fortnitetracker.com/site-api) | Fortnite Stats | `apiKey` | Yes | Unknown |