Add API docs link to README (#106)

* Update

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -144,6 +144,8 @@ For example, the folder structure in Admin App folder may look like the followin
 
 The Admin App provides you with several extensibility points for plugging your functionality in the interface.
 
+You can find more details about the API we provide in the [API documentation](http://admin-app-extensions-docs.sitefinity.site/index.html).
+
 Take a look at the following overview of the Admin App extension samples we provide, as well as short descriptions and, where relevant, links to more detailed explanations about how to use each sample. You can also check out the high level Admin App extensibility overview in the [Sitefinity CMS documentation] (https://www.progress.com/documentation/sitefinity-cms/technical-overview-and-extensibility).
 
 * [Custom *Actions* menu](./commands-extender/README.md) - You can register a custom command in the Actions menu of an item.