Добавлены собственные исключения

SelfPropelledArtilleryUnit/ArtilleryNotFoundException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SelfPropelledArtilleryUnit
+{
+    [Serializable]
+    internal class ArtilleryNotFoundException : ApplicationException
+    {
+        public ArtilleryNotFoundException(int i) : base($"Не найден объект по позиции {i}") { }
+        public ArtilleryNotFoundException() : base() { }
+        public ArtilleryNotFoundException(string message) : base(message) { }
+        public ArtilleryNotFoundException(string message, Exception exception) : base(message, exception) { }
+        protected ArtilleryNotFoundException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+    }
+}

SelfPropelledArtilleryUnit/StorageOverflowException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SelfPropelledArtilleryUnit
+{
+    [Serializable]
+    internal class StorageOverflowException : ApplicationException
+    {
+        public StorageOverflowException(int count) : base($"В наборе превышенодопустимое количество: {count}") { }
+        public StorageOverflowException() : base() { }
+        public StorageOverflowException(string message) : base(message) { }
+        public StorageOverflowException(string message, Exception exception) : base(message, exception) { }
+        protected StorageOverflowException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+    }
+}