Add Zero Width Shortener

README.md

@@ -914,6 +914,7 @@ API | Description | Auth | HTTPS | CORS |
 | [ClickMeter](https://support.clickmeter.com/hc/en-us/categories/201474986) | Monitor, compare and optimize your marketing links | `apiKey` | Yes | Unknown |
 | [Rebrandly](https://developers.rebrandly.com/v1/docs) | Custom URL shortener for sharing branded links | `apiKey` | Yes | Unknown |
 | [Relink](https://rel.ink) | Free and secure URL shortener | No | Yes | Yes |
+| [Zero Width Shortener](https://docs.zws.im) | Shortens URLs using spaces that have zero width, making them invisible to humans | No | Yes | Unknown |
 
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