[Add] Basic project architecture

Assets/Minesweeper/Runtime/Core/GameState.cs

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+namespace Minesweeper.Core
+{
+    public enum GameState
+    {
+        FieldSelection,
+        Preparing,
+        Playing,
+        Lost,
+        Won
+    }
+}

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

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+fileFormatVersion: 2
+guid: c06ebf54d6bacdf4888fabbf29bea1cd

Assets/Minesweeper/Runtime/Core/GameStateService.cs

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+using System;
+
+namespace Minesweeper.Core
+{
+    public sealed class GameStateService : IGameStateService
+    {
+        public event Action<GameState> StateChanged;
+
+        public GameState Current { get; private set; } = GameState.FieldSelection;
+
+        public void SetState(GameState state)
+        {
+            if (Current == state)
+            {
+                return;
+            }
+
+            Current = state;
+            StateChanged?.Invoke(Current);
+        }
+    }
+}

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

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+fileFormatVersion: 2
+guid: cf69805439993c14887ea7bb9b15bd02

Assets/Minesweeper/Runtime/Core/IGameStateService.cs

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+using System;
+
+namespace Minesweeper.Core
+{
+    public interface IGameStateService
+    {
+        event Action<GameState> StateChanged;
+
+        GameState Current { get; }
+
+        void SetState(GameState state);
+    }
+}

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

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7aea04a8c0e8d3a4e8d991a4348430db