doc: Update README.md

Author: jaywcjlove

core/README.md

@@ -396,6 +396,8 @@ export interface JsonViewProps<T> extends React.DetailedHTMLProps<React.HTMLAttr
   enableClipboard?: boolean;
   /** Display for quotes in object-key @default " */
   quotes?: "'" | '"' | '';
+  /** When set to true, all nodes will be collapsed by default. Use an integer value to collapse at a particular depth. @default false */
+  collapsed?: boolean | number;
   /** Callback function for when a treeNode is expanded or collapsed */
   onExpand?: (props: {
     expand: boolean;