add Percent % to Units

csharp/Lib/Units/Percent.cs

@@ -0,0 +1,29 @@
+namespace InnovEnergy.Lib.Units;
+
+using T = Percent;
+
+public readonly struct Percent
+{
+    public static String Unit   => "%"; 
+    public static String Symbol => "%"; // ??
+
+    public Percent(Decimal value)
+    {
+        if (value < 0)
+            throw new ArgumentException(nameof(Frequency) + " cannot be negative", nameof(value));
+        
+        Value = value;
+    }
+    
+    // not generated
+    
+    public Decimal Value { get; }
+    public override String ToString() => Value + Unit;
+    
+    // scalar multiplication
+    public static Decimal operator *(Decimal scalar, T t) => scalar * t.Value/100m;
+    public static Decimal operator *(T t, Decimal scalar) => scalar * t.Value/100m;
+
+    // parallel
+    public static Percent operator |(T left, T right) => new T((left.Value + right.Value)/2m);
+}