feat: Begins manual d core models.

Sources/ManualDCore/EquipmentInfo.swift

@@ -0,0 +1,17 @@
+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
+  }
+}