add unity doc.

unity/PICO-Unity-Integration-SDK-release_3.4.0/Runtime/BuildingBlocks/SliderText.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class SliderText : MonoBehaviour
+{
+    public Text text;
+    private Slider m_Slider;//Slider<65><72><EFBFBD><EFBFBD>
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        m_Slider = GetComponent<Slider>();
+        m_Slider.onValueChanged.AddListener(delegate {ValueChangeCheck(); });
+    }
+
+    private void ValueChangeCheck()
+    {
+        text.text = m_Slider.value.ToString();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+
+}