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

docs/comment-process.service.md

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+# Comment Process service
+
+Adds and retrieves comments for task and process instances in Process Services.
+
+## Methods
+
+`addTaskComment(taskId: string, message: string): Observable<CommentProcessModel>`<br/>
+Adds a comment to a task.
+
+`getTaskComments(taskId: string): Observable<CommentProcessModel[]>`<br/>
+Gets all comments that have been added to a task.
+
+`addProcessInstanceComment(processInstanceId: string, message: string): Observable<CommentProcessModel>`<br/>
+Adds a comment to a process instance.
+
+`getProcessInstanceComments(processInstanceId: string): Observable<CommentProcessModel[]>`<br/>
+Gets all comments that have been added to a process instance.
+
+## Details
+
+See the [Comment Process model](comment-process.model.md) for more information about the
+comments returned by the methods of this service. Also, the Comments API section of the
+[Alfresco JS API docs](https://github.com/Alfresco/alfresco-js-api/tree/master/src/alfresco-activiti-rest-api)
+has further details about the underlying REST API.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Comment process model](comment-process.model.md)
+<!-- seealso end -->
+
+
+