[4.1] Add Joomla! Accessibility Team to the code owners (#35629)

* add Joomla! Accessibility Team to the code owners

* add cassiopeia

* add everything in the templates

Author: zero-24

.github/CODEOWNERS

@@ -66,3 +66,14 @@ libraries/src/MVC/Model/Workflow*	@bembelimen @hleithner
 libraries/src/Workflow/*	@bembelimen @hleithner
 build/media_source/com_workflow/*	@bembelimen @hleithner
 plugins/workflow/*	@bembelimen @hleithner
+
+# Joomla! Accessibility Team
+administrator/*/components/*/tmpl/* @chmst
+administrator/*/modules/*/tmpl/* @chmst
+administrator/templates/atum/* @chmst
+components/*/tmpl/* @chmst
+modules/*/tmpl/* @chmst
+plugins/*/tmpl/* @chmst
+templates/cassiopeia/* @chmst
+layouts/* @chmst
+installation/tmpl/* @chmst