[Add] UI, menu, pause and timer

Assets/Minesweeper/Runtime/Core/GamePauseService.cs

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+using System;
+
+namespace Minesweeper.Core
+{
+    public sealed class GamePauseService : IGamePauseService
+    {
+        public event Action<bool> PauseChanged;
+
+        public bool IsPaused { get; private set; }
+
+        public void Pause()
+        {
+            if (IsPaused)
+            {
+                return;
+            }
+
+            IsPaused = true;
+            PauseChanged?.Invoke(IsPaused);
+        }
+
+        public void Resume()
+        {
+            if (!IsPaused)
+            {
+                return;
+            }
+
+            IsPaused = false;
+            PauseChanged?.Invoke(IsPaused);
+        }
+    }
+}

Assets/Minesweeper/Runtime/Core/GamePauseService.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 40441c28481279147959eafabd8a032a

Assets/Minesweeper/Runtime/Core/GameTimerService.cs

@@ -0,0 +1,48 @@
+using System;
+using UnityEngine;
+using VContainer.Unity;
+
+namespace Minesweeper.Core
+{
+    public sealed class GameTimerService : IGameTimerService, ITickable
+    {
+        private readonly IGamePauseService pauseService;
+        private readonly IGameStateService gameStateService;
+        private int lastReportedSeconds = -1;
+
+        public GameTimerService(IGameStateService gameStateService, IGamePauseService pauseService)
+        {
+            this.gameStateService = gameStateService;
+            this.pauseService = pauseService;
+        }
+
+        public event Action<float> TimeChanged;
+
+        public float ElapsedSeconds { get; private set; }
+
+        public void Tick()
+        {
+            if (gameStateService.Current != GameState.Playing || pauseService.IsPaused)
+            {
+                return;
+            }
+
+            ElapsedSeconds += Time.deltaTime;
+            var seconds = Mathf.FloorToInt(ElapsedSeconds);
+            if (seconds == lastReportedSeconds)
+            {
+                return;
+            }
+
+            lastReportedSeconds = seconds;
+            TimeChanged?.Invoke(ElapsedSeconds);
+        }
+
+        public void Reset()
+        {
+            ElapsedSeconds = 0f;
+            lastReportedSeconds = -1;
+            TimeChanged?.Invoke(ElapsedSeconds);
+        }
+    }
+}

Assets/Minesweeper/Runtime/Core/GameTimerService.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ed8262be24a32a04abfd5bc5ec8544bb

Assets/Minesweeper/Runtime/Core/IGamePauseService.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Minesweeper.Core
+{
+    public interface IGamePauseService
+    {
+        event Action<bool> PauseChanged;
+
+        bool IsPaused { get; }
+
+        void Pause();
+        void Resume();
+    }
+}

Assets/Minesweeper/Runtime/Core/IGamePauseService.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 82dfb9fe1e7004f4f88df366f8e76b2d

Assets/Minesweeper/Runtime/Core/IGameTimerService.cs

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+using System;
+
+namespace Minesweeper.Core
+{
+    public interface IGameTimerService
+    {
+        event Action<float> TimeChanged;
+
+        float ElapsedSeconds { get; }
+
+        void Reset();
+    }
+}

Assets/Minesweeper/Runtime/Core/IGameTimerService.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 61242d395cb1d974daffd9e0815ec34c