[ADF-1586] Added Core services docs (#2587)

docs/discovery-api.service.md

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+# Discovery Api service
+
+Gets version and license information for Process Services and Content Services.
+
+## Methods
+
+`public getEcmProductInfo(): Observable<EcmProductVersionModel>`<br/>
+Gets product information for Content Services.
+
+`public getBpmProductInfo(): Observable<BpmProductVersionModel>`<br/>
+Gets product information for Process Services.
+
+## Details
+
+The product license and version information is returned using the
+classes defined in the [Product Version model](product-version.model.md).
+See the
+[Alfresco JS API docs](https://github.com/Alfresco/alfresco-js-api/tree/master/src/alfresco-discovery-rest-api)
+to learn more about the REST API used by this service.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Product version model](product-version.model.md)
+<!-- seealso end -->
+
+
+