feat: Begins manual d core models.

Sources/ManualDCore/ComponentPressureLosses.swift

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+import Foundation
+
+public typealias ComponentPressureLosses = [String: Double]
+
+extension ComponentPressureLosses {
+  public var totalLosses: Double { values.reduce(0) { $0 + $1 } }
+}

Sources/ManualDCore/CoolingLoad.swift

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+import Foundation
+
+public struct CoolingLoad: Codable, Equatable {
+  public let total: Double
+  public let sensible: Double
+  public var latent: Double { total - sensible }
+  public var shr: Double { sensible / total }
+
+  public init(total: Double, sensible: Double) {
+    self.total = total
+    self.sensible = sensible
+  }
+}

Sources/ManualDCore/EquipmentInfo.swift

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+import Foundation
+
+public struct EquipmentInfo: Codable, Equatable {
+  public let staticPressure: Double
+  public let heatingCFM: Int
+  public let coolingCFM: Int
+
+  public init(
+    staticPressure: Double = 0.5,
+    heatingCFM: Int,
+    coolingCFM: Int
+  ) {
+    self.staticPressure = staticPressure
+    self.heatingCFM = heatingCFM
+    self.coolingCFM = coolingCFM
+  }
+}

Sources/ManualDCore/Room.swift

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+import Foundation
+
+public struct Room: Codable, Equatable {
+  public let name: String
+  public let heatingLoad: Double
+  public let coolingLoad: CoolingLoad
+  public let registerCount: Int
+
+  public init(
+    name: String,
+    heatingLoad: Double,
+    coolingLoad: CoolingLoad,
+    registerCount: Int = 1
+  ) {
+    self.name = name
+    self.heatingLoad = heatingLoad
+    self.coolingLoad = coolingLoad
+    self.registerCount = registerCount
+  }
+}