demo: add performance demo

Samples~/Performance Demo/NanoMonitor/Scripts/ProjectSettings~/MiniProfilerSettings.cs

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+using System;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Coffee.MiniProfiler
+{
+    internal class MiniProfilerSettings : ScriptableSettings<MiniProfilerSettings>
+    {
+        [Header("UI")]
+        [SerializeField] private Font m_Font = null;
+
+        [Header("Instantiate On Boot")]
+        [SerializeField] private GameObject miniProfilerPrefab = null;
+        [SerializeField] private string[] m_SceneNames = new string[0];
+
+        public Font font => m_Font;
+        public event Action onFontChanged;
+
+        protected override void OnBoot()
+        {
+            SceneManager.sceneLoaded -= OnSceneLoaded;
+            SceneManager.sceneLoaded += OnSceneLoaded;
+        }
+
+        public void OnSceneLoaded(Scene scene, LoadSceneMode __)
+        {
+            SceneManager.sceneLoaded -= OnSceneLoaded;
+            if (!miniProfilerPrefab || !m_SceneNames.Contains(scene.name)) return;
+
+            var go = Instantiate(miniProfilerPrefab);
+            if (Application.isPlaying)
+                DontDestroyOnLoad(go);
+        }
+
+        protected override bool bootOnPlayMode => true;
+        protected override bool bootOnEditorMode => false;
+
+#if UNITY_EDITOR
+        protected override void OnValidate()
+        {
+            onFontChanged?.Invoke();
+            base.OnValidate();
+        }
+
+        private void Reset()
+        {
+            m_Font = UnityEngine.Resources.GetBuiltinResource<Font>("Arial.ttf");
+        }
+
+        [UnityEditor.SettingsProvider]
+        private static UnityEditor.SettingsProvider CreateSettingsProvider() => new ScriptableSettingsProvider<MiniProfilerSettings>();
+#endif
+    }
+}