Add Free Dictionary API (#1846)

README.md

@@ -379,6 +379,7 @@ API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
 | [Chinese Character Web](http://ccdb.hemiola.com/) | Chinese character definitions and pronunciations | No | No | No |
 | [Chinese Text Project](https://ctext.org/tools/api) | Online open-access digital library for pre-modern Chinese texts | No | Yes | Unknown |
+| [Free Dictionary](https://dictionaryapi.dev/) | Definitions, phonetics, pronounciations, parts of speech, examples, synonyms | No | Yes | Unknown |
 | [Lingua Robot](https://www.linguarobot.io) | Word definitions, pronunciations, synonyms, antonyms and others | `apiKey` | Yes | Yes |
 | [Merriam-Webster](https://dictionaryapi.com/) | Dictionary and Thesaurus Data | `apiKey` | Yes | Unknown |
 | [OwlBot](https://owlbot.info/) | Definitions with example sentence and photo if available | `apiKey` | Yes | Yes |