Update User Guide - Note for COG layer

docs/user-guide/catalog.md

@@ -363,10 +363,34 @@ In **General Settings** of a COG source type, it is possible to specify the serv
 !!! Note
     To properly display COG layers in your MapStore map, it is necessary to add the reference system definition supported by the COG in the MapStore [projectionDefs configuration](../../developer-guide/local-config/#projectiondefs-configuration)
 
+!!! warning
+    The feature is currently in experimental state, and won't be available in the default service types list of the catalog.
+    In order to enable this service, update the [MetadataExplorer plugin's configuration](https://mapstore.geosolutionsgroup.com/mapstore/docs/api/plugins#plugins.MetadataExplorer) in `localConfig.json` as shown below
+
+    ```diff
+    {
+        "name": "MetadataExplorer",
+        "cfg": {
+            ...
+            serviceTypes: [
+                ...
+    +           { name: "cog", label: "COG" }
+            ]
+        }
+    }
+    ```
+
 #### Advanced Settings
 
 In addition to the standard options, only for COG catalog sources, through the **Advanced Settings** the user can configure also the following option:
 
 <img src="../img/catalog/advanced_settings_cog.jpg" class="ms-docimage"  style="max-width:600px;"/>
 
 * *Download file metadata on search*: this option will fetch metadata to support the zoom to layer when the layer is added to the [TOC](toc.md#table-of-contents).
+
+!!! warning
+    For now, the implementation of the COG catalog on MapStore is experimental and the features currently available for the COG layers are:
+
+    * *Zoom to selected layer extent* <img src="../img/button/zoom-layer.jpg" class="ms-docbutton"/>: in order to zoom the map to the layer's extent
+    * Access the [Layer Settings](layer-settings.md#layer-settings) <img src="../img/button/properties.jpg" class="ms-docbutton"/> to view/edit the [General Information](layer-settings.md#general-information) and customize the *Opacity* value and the *Visibility limits* from the [Display](layer-settings.md#display) tab
+    * *Remove* the layer <img src="../img/button/delete.jpg" class="ms-docbutton"/>