add themeInfo property

Runtime/API/BaseChart_API.cs

@@ -18,6 +18,10 @@ namespace XCharts
     /// </summary>
     public partial class BaseChart
     {
+        /// <summary>
+        /// The theme info.
+        /// </summary>
+        public ThemeInfo themeInfo { get { return m_ThemeInfo; } }
         /// <summary>
         /// The title setting of chart.
         /// 标题组件