UnitSystem inplementation started, Calculation started

UnitSystem/Systems/IUnitSystem.cs

@@ -0,0 +1,14 @@
+using System;
+using StructureHelper.UnitSystem.Enums;
+
+namespace StructureHelper.UnitSystem.Systems
+{
+    public interface IUnitSystem
+    {
+        string Name { get; }
+        Tuple<Force, MultiplyPrefix> ForceUnits { get; }
+        Tuple<Pressure, MultiplyPrefix> PressureUnits { get; }
+        Tuple<Length, MultiplyPrefix> LengthUnits { get; }
+        double ConvertLength(double length);
+    }
+}