feat: Initial commit

Sources/SharedModels/PlenumDimension.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+public enum PlenumDimension: Equatable {
+  case rectangular(width: Double, height: Double)
+  case round(Double)
+  
+  public var areaInSquareFeet: Double {
+    switch self {
+      
+    case .rectangular(width: let width, height: let height):
+      return (width * height) / 144
+      
+    case let .round(dimension):
+      return pow((dimension / 12) / 2, 2) * Double.pi
+    }
+  }
+  
+  public enum Key: String, Equatable, CaseIterable, CustomStringConvertible {
+    
+    case rectangular, round
+    
+    public var description: String { rawValue.capitalized }
+  }
+
+  public var key: Key {
+    switch self {
+    case .rectangular:
+      return .rectangular
+    case .round:
+      return .round
+    }
+  }
+}