Added servings

Sources/Units/Units.swift

@@ -67,6 +67,7 @@ public enum UnitCategory: String, CaseIterable, CustomStringConvertible,
 	case temperature
 	case speed
 	case energy
+	case quantity
 	// Add more categories as needed
 
 	public var description: String {
@@ -141,6 +142,9 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 	case kilocalorie = "kcal"
 	case kilojoule = "kJ"
 
+	// MARK: Quantity units
+	case servings = "servings"
+
 	public init?(rawValue: String) {
 		if let unit = Unit.allCases.first(where: {
 			$0.rawValue.lowercased() == rawValue.lowercased()
@@ -170,6 +174,8 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 			return .speed
 		case .kilocalorie, .kilojoule, .joule:
 			return .energy
+		case .servings:
+			return .quantity
 		}
 	}
 
@@ -230,6 +236,9 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 		case .kilojoule: 1000.0
 		case .kilocalorie: 4184.0
 
+		// Quantity (Base: Servings)
+		case .servings: 1.0
+
 		}
 	}
 
@@ -522,6 +531,7 @@ extension UnitCategory {
 		case .temperature: return .celsius
 		case .speed: return .metersPerSecond
 		case .energy: return .joule
+		case .quantity: return .servings
 		}
 	}
 }
@@ -591,6 +601,9 @@ extension ConvertibleToDouble {
 	public var kJ: UnitValue<Self> { .init(value: self, unit: .kilojoule) }
 	public var kcal: UnitValue<Self> { .init(value: self, unit: .kilocalorie) }
 
+	// MARK: Quantity Initializers
+	public var servings: UnitValue<Self> { .init(value: self, unit: .servings) }
+
 	// MARK: - Subscripts for Numeric
 	/// Allows creating a UnitValue directly from a numeric literal using a Unit enum case.
 	/// Example: `10[.kg]`
@@ -670,6 +683,9 @@ extension UnitValue where ValueType: ConvertibleToDouble {  // Apply constraints
 	public var kJ: UnitValue<Double>? { converted(to: .kilojoule) }
 	public var kcal: UnitValue<Double>? { converted(to: .kilocalorie) }
 
+	// MARK: Quantity Conversions
+	public var servings: UnitValue<Double>? { converted(to: .servings) }
+
 }
 
 // MARK: - Height Conversion Extensions