add Datamuse API

README.md

@@ -200,6 +200,7 @@ APIs
 
 - [Agarathi](https://agarathi.com/api/dictionary) - Tamil language Dictionary API 💸
 - [Cambridge Dictionaries Online](http://dictionary.cambridge.org/license.html) - Access to Cambridge’s custom-developed API. 💸
+- [Datamuse API](https://www.datamuse.com/api/) - Word-finding query engine that finds words that match a given set of constraints and that are likely in a given context. 💸
 - [DictService](http://services.aonaware.com/DictService/DictService.asmx) - This Web Service allows you to access dictionary definitions from the dict.org service.
 - [Glosbe API](https://glosbe.com/a-api) - Dictionary API and Translation Memory API description.
 - [Lingua Robot API](https://www.linguarobot.io/) - Definition of words, pronunciations, synonyms and antonyms, lemmatization and morpheme segmentation. 💸