增加Demo首页，展示代码控制效果

Demo/Scripts/Demo_Test.cs

@@ -0,0 +1,32 @@
+using UnityEngine;
+using UnityEngine.UI;
+using XCharts;
+
+[DisallowMultipleComponent]
+[ExecuteInEditMode]
+public class Demo_Test : MonoBehaviour
+{
+    LineChart chart;
+    void Awake()
+    {
+        chart = gameObject.GetComponent<LineChart>();
+        if (chart == null)
+        {
+            chart = gameObject.AddComponent<LineChart>();
+        }
+
+        var buttom = transform.parent.gameObject.GetComponentInChildren<Button>();
+        buttom.onClick.AddListener(AddData);
+    }
+
+    void AddData()
+    {
+        chart.series.list[0].ClearData();
+        chart.series.list[1].ClearData();
+        for (int i = 0; i < 5; i++)
+        {
+            chart.AddData(0, Random.Range(20, 100));
+            chart.AddData(1, Random.Range(1, 10));
+        }
+    }
+}