Add API Sprout to new mock server section

Author: danielgtaylor

IMPLEMENTATIONS.md

@@ -43,6 +43,11 @@ These tools are not endorsed by the OAI.
 | Widdershins | [github/Mermade/widdershins](https://github.com/Mermade/widdershins) | Node.js | Generate Slate/Shins markdown from OpenAPI 3.0.x |
 | angular-swagger-ui | [github/angular-swagger-ui](https://github.com/Orange-OpenSource/angular-swagger-ui) | AngularJS | An angularJS implementation of Swagger UI |
 
+#### Mock Servers
+| Title          | Project Link | Language | Description |
+| -------------- | ------------ | -------- | ----------- |
+| API Sprout     | [github/danielgtaylor/apisprout](https://github.com/danielgtaylor/apisprout) | CLI / Docker | Lightweight, blazing fast, cross-platform OpenAPI 3 mock server with validation |
+
 #### Server Implementations
 | Title          | Project Link | Language |Description                          |
 |----------------|--------------|----------|---------------------|