[ADF-1586] Added Core services docs (#2582)

docs/page-title.service.md

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+# Page Title service
+
+Sets the page title.
+
+## Methods
+
+`setTitle(value: string = '')`<br/>
+Sets the page title.
+
+## Details
+
+If an application name is supplied in the app config file then this will
+be concatenated with the `value` parameter when `setTitle` is called, giving
+a result of the form "PageName - AppName" (see
+[App Config service](app-config.service.md) for more information). If `value`
+is not supplied then just the app name is used; this will default to
+"Alfresco ADF Application" when no app name set in the config file.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [App config service](app-config.service.md)
+<!-- seealso end -->
+
+
+