feat: Begins manual d core models.

Sources/ManualDCore/Room.swift

@@ -0,0 +1,20 @@
+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
+  }
+}