Create at39bis-getcapabilities-harmonised-layer-name.md

Add a new test related to the new requirement 39 bis (see TG release changelog: https://github.com/INSPIRE-MIF/technical-guidelines/releases/tag/2022.2).

iso-19128/at39bis-getcapabilities-harmonised-layer-name.md

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+# Harmonised Layer Name
+
+**Purpose**: Test that at least a harmonised layer according to [IR IOP](./README.md#ref_IR_IOP) is present, which layer name shall comply with the harmonised layer name defined in Article 14 of [IR IOP](./README.md#ref_IR_IOP).
+
+**Prerequisites**: The WMS is related to a harmonized dataset (to be manually checked).
+
+**Test method**
+
+* Send a getCapabilities request to the service endpoint. Into the response:
+
+  * Check that at least a [Layer](#layer) element with the value of the [Layer Name](#layerName) element that matches one of the harmonised layer names given in [IR IOP](./README.md#ref_IR_IOP) or its amendments, is present.
+
+  * If no layers are found, report a warning message indicating that if the WMS under test is related to a harmonized dataset at least a harmonised layer according to [IR IOP](./README.md#ref_IR_IOP) shall be present.
+
+**Reference(s)**:
+* [TG VS](./README.md#ref_TG_VS), Chapter 4.2.3.3.4.6, Requirement 39 bis
+* [IR IOP](./README.md#ref_IR_IOP), Article 14
+
+**Test type**: Automated
+
+**Notes**
+
+A view service may contain one or more harmonised and/or one or more non-harmonised layers.
+
+The multiplicity of this element is 1 for each named Layer.
+
+A Layer that contains a Named child element is a 'named Layer'.
+
+**Contextual XPath references**
+
+The namespace prefixes used as described in [README.md](./README.md#namespaces).
+
+Abbreviation                                               |  XPath expression (relative to /wms:WMS_Capabilities)
+---------------------------------------------------------- | -------------------------------------------------------------------------
+Layer <a name="layer"></a> | wms:Capability/*/wms:Layer
+Layer Name <a name="layerName"></a> | wms:Capability/*/wms:Layer/wms:Name