docs: update

Author: jcs090218

docs/ScriptReference/UI/Dropdown/JCS_DropdownQuality.md

@@ -0,0 +1,16 @@
+# JCS_DropdownQuality
+
+A dropdown menu let you choose the quality level.
+
+## Variables
+
+| Name                   | Description                                         |
+|:-----------------------|:----------------------------------------------------|
+| mRemoveAllOptions      | If true, remove all other options at the beginning. |
+| mApplyExpensiveChanges | Should expensive changes be applied.                |
+
+## Functions
+
+| Name    | Description               |
+|:--------|:--------------------------|
+| Refresh | Refresh all options once. |