Minor - V0.1.0 - Add assets and setup the env for android handheld

Assets/script/GameManager.cs

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+using UnityEngine;
+
+namespace script
+{
+    public class GameManager : MonoBehaviour
+    {
+        private static GameManager _instance;
+        
+        private void Awake()
+        {
+            if (_instance != null && _instance != this)
+            {
+                Destroy(this.gameObject);
+            }
+            else
+            {
+                _instance = this;
+                DontDestroyOnLoad(this.gameObject);
+            }
+
+            #if UNITY_ANDROID
+            {
+                Screen.orientation = ScreenOrientation.LandscapeLeft;
+                var refreshRate = Screen.currentResolution.refreshRateRatio.numerator;
+                Application.targetFrameRate = 10000; //(int)refreshRate;
+            }
+            #endif
+        }
+    
+        // Start is called once before the first execution of Update after the MonoBehaviour is created
+        void Start()
+        {
+        
+        }
+
+        // Update is called once per frame
+        void Update()
+        {
+        
+        }
+    }
+}

Assets/script/GameManager.cs.meta

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+fileFormatVersion: 2
+guid: 05db99b32de928246a0a6fac6552f575