Added doxygen comments to common namespace

uml/class/template_trait_hierarchy_class.yml

@@ -0,0 +1,21 @@
+type: class
+include_relations_also_as_members: true
+generate_packages: true
+glob:
+  - src/common/model/*.cc
+  - src/class_diagram/model/*.cc
+  - src/sequence_diagram/model/*.cc
+  - src/include_diagram/model/*.cc
+  - src/package_diagram/model/*.cc
+include:
+  namespaces:
+    - clanguml
+  subclasses:
+    - clanguml::common::model::template_trait
+  context:
+    - clanguml::common::model::template_trait
+exclude:
+  access: [ public, protected, private ]
+  relationships: [ dependency ]
+using_namespace:
+  - clanguml