Add WolframAlpha (#2129)

README.md

@@ -818,6 +818,7 @@ API | Description | Auth | HTTPS | CORS |
 | [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 |
+| [WolframAlpha](https://products.wolframalpha.com/api/) | Provides specific answers to questions using data and algorithms | `apiKey` | Yes | Unknown |
 
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