[Add] GameLoop base

Assets/Scripts/Run/StoredRollBank.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace YachtDice.Run
+{
+    public sealed class StoredRollBank
+    {
+        public int Value { get; private set; }
+
+        public event Action<int> OnChanged;
+
+        public void Reset()
+        {
+            SetValue(0);
+        }
+
+        public void Add(int amount)
+        {
+            if (amount <= 0)
+                return;
+
+            SetValue(Value + amount);
+        }
+
+        public bool TrySpend(int amount)
+        {
+            if (amount <= 0 || Value < amount)
+                return false;
+
+            SetValue(Value - amount);
+            return true;
+        }
+
+        private void SetValue(int value)
+        {
+            Value = Math.Max(0, value);
+            OnChanged?.Invoke(Value);
+        }
+    }
+}