Option monad

Option.cs

Option<int> aValue = 2;
aValue.Map(x => x + 3); // Some(5)

Option<int> none = None;
none.Map(x => x + 3); // None

//Left -> Some, Right -> None
aValue.Match(x => x + 3, () => 0); // 5
none.Match(x => x + 3, () => 0); // 0

// Returns the Some case 'as is' -> 2 and 1 in the None case
int value = aValue.IfNone(1);
int noneValue = none.IfNone(42); // 42