Add Perspective (#1989)

README.md

@@ -761,6 +761,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Keen IO](https://keen.io/) | Data Analytics | `apiKey` | Yes | Unknown |
 | [NLP Cloud](https://nlpcloud.io) | NLP API using spaCy and transformers for NER, sentiments, classification, summarization, and more | `apiKey` | Yes | Unknown |
 | [OpenVisionAPI](https://openvisionapi.com) | Open source computer vision API based on open source models | No | Yes | Yes |
+| [Perspective](https://perspectiveapi.com) | NLP API to return probability that if text is toxic, obscene, insulting or threatening | `apiKey` | Yes | Unknown |
 | [Time Door](https://timedoor.io) | A time series analysis API | `apiKey` | Yes | Yes |
 | [Unplugg](https://unplu.gg/test_api.html) | Forecasting API for timeseries data | `apiKey` | Yes | Unknown |
 | [Wit.ai](https://wit.ai/) | Natural Language Processing | `OAuth` | Yes | Unknown |