Init from string and unit lowercased init subscript

Sources/Units/Units.swift

@@ -236,7 +236,7 @@ public enum Unit: String, CaseIterable, CustomStringConvertible, Codable,
 	public var description: String { rawValue }
 
 	public static subscript(rawValue: String) -> Unit? {
-		.init(rawValue: rawValue)
+		.init(rawValue: rawValue.lowercased())
 	}
 
 	public static subscript(category: UnitCategory) -> [Unit] {
@@ -273,6 +273,22 @@ public struct UnitValue<ValueType: ConvertibleToDouble>:
 		self.unit = unit
 	}
 
+	/// Initializes from a String. eg. 100 mL
+	public init?(from s: String) {
+		let splitted = s.split(separator: " ")
+		guard splitted.count == 2 else {
+			return nil
+		}
+
+		guard let unit = Unit[String(splitted[1])],
+			let value = Double(splitted[0]) as? ValueType
+		else {
+			return nil
+		}
+
+		self.init(value: value, unit: unit)
+	}
+
 	// MARK: Conversion Logic
 	/// Converts the current UnitValue to a specified target unit.
 	/// - Parameter targetUnit: The unit to convert to.