增加代码API注释文档，整理代码

Scripts/UI/Component/Bar.cs

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+using UnityEngine;
+
+namespace XCharts
+{
+    /// <summary>
+    /// bar component.global setting for bar chart.
+    /// 柱状图的全局配置组件。
+    /// </summary>
+    [System.Serializable]
+    public class Bar
+    {
+        [SerializeField] private bool m_InSameBar = false;
+        [SerializeField] private float m_BarWidth = 0.7f;
+        [SerializeField] private float m_Space = 10;
+
+        /// <summary>
+        /// Whether to draw all bar in the same bar,but not stacked.
+        /// 非堆叠同柱。多序列绘制在同一bar上，但不堆叠，而是覆盖绘制。
+        /// </summary>
+        public bool inSameBar { get { return m_InSameBar; } set { m_InSameBar = value; } }
+        /// <summary>
+        /// the width of bar.
+        /// 状态的宽度。
+        /// </summary>
+        public float barWidth { get { return m_BarWidth; } set { m_BarWidth = value; } }
+        /// <summary>
+        /// the space of bars.
+        /// 多柱状间的间距。
+        /// </summary>
+        public float space { get { return m_Space; } set { m_Space = value; } }
+
+        public static Bar defaultBar
+        {
+            get
+            {
+                return new Bar()
+                {
+                    m_InSameBar = false,
+                    m_BarWidth = 0.6f,
+                    m_Space = 10
+                };
+            }
+        }
+    }
+}