docs: updated templated, added layers

tests/3_layers_copy.drawio

@@ -0,0 +1,12 @@
+<mxfile host="multicloud-diagrams" agent="PIP package multicloud-diagrams. Generate resources in draw.io compatible format for Cloud infrastructure. Copyrights @ Roman Tsypuk 2023. MIT license." type="MultiCloud">
+	<diagram id="diagram_1" name="AWS components">
+		<mxGraphModel dx="1015" dy="661" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="1">
+			<root>
+				<mxCell id="0" />
+				<mxCell id="1" parent="0" />
+				<mxCell id="2" parent="0" value="L2" />
+				<mxCell id="3" parent="0" value="L3" />
+			</root>
+		</mxGraphModel>
+	</diagram>
+</mxfile>

tests/test_layers.py

@@ -155,7 +155,7 @@ def test_read_layers_from_file(self):
         mcd = MultiCloudDiagrams()
         # file contains 3 layers default, L2, L3
         # file_name = '3_layers.drawio'
-        file_name = 'tests/3_layers.drawio'
+        file_name = 'tests/3_layers_copy.drawio'
 
         # when
         mcd.read_nodes_from_file(file_name)