UnitSystem inplementation started, Calculation started

UnitSystem/UnitSystemService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using StructureHelper.UnitSystem.Systems;
+
+namespace StructureHelper.UnitSystem
+{
+    public class UnitSystemService
+    {
+        private IUnitSystem currentSystem;
+        public IUnitSystem GetCurrentSystem() => currentSystem;
+        public UnitSystemService()
+        {
+            currentSystem = new SystemSi();
+        }
+    }
+}