Create mkdocs_complete_material_strict.yml

`mkdocs serve -f ./tests/basic_setup/mkdocs_complete_material_strict_false.yml --strict`

Build fails with WARNING for non-committed files, e.g. temp files created by plugins

Author: polymorcodeus

tests/basic_setup/mkdocs_complete_material_strict.yml

@@ -0,0 +1,11 @@
+site_name: test gitauthors_plugin with material theme and git-authors - strict true
+use_directory_urls: true
+
+theme:
+    name: 'material'
+    language: nl
+
+plugins:
+    - search
+    - git-authors:
+        strict: true