add some more checks.

src/paperless/checks.py

@@ -67,3 +67,16 @@ def binaries_check(app_configs, **kwargs):
             check_messages.append(Warning(error.format(binary), hint))
 
     return check_messages
+
+
+@register()
+def debug_mode_check(app_configs, **kwargs):
+    if settings.DEBUG:
+        return [Warning("DEBUG mode is enabled. Disable Debug mode. "
+                        "This is a serious security "
+                        "issue, since it puts security overides in place which"
+                        "are meant to be only used during development. This"
+                        "also means that paperless will tell anyone various"
+                        "debugging information when something goes wrong.")]
+    else:
+        return []