Add default config example to config template

InvenTree/config_template.yaml

@@ -87,3 +87,20 @@ latex:
   interpreter: pdflatex 
   # Extra options to pass through to the LaTeX interpreter
   options: ''
+
+# Permit custom authentication backends
+#authentication_backends:
+#  - 'django.contrib.auth.backends.ModelBackend'
+
+#  Custom middleware, sometimes needed alongside an authentication backend change.
+#middleware:
+#  - 'django.middleware.security.SecurityMiddleware'
+#  - 'django.contrib.sessions.middleware.SessionMiddleware'
+#  - 'django.middleware.locale.LocaleMiddleware'
+#  - 'django.middleware.common.CommonMiddleware'
+#  - 'django.middleware.csrf.CsrfViewMiddleware'
+#  - 'corsheaders.middleware.CorsMiddleware'
+#  - 'django.contrib.auth.middleware.AuthenticationMiddleware'
+#  - 'django.contrib.messages.middleware.MessageMiddleware'
+#  - 'django.middleware.clickjacking.XFrameOptionsMiddleware'
+#  - 'InvenTree.middleware.AuthRequiredMiddleware'