feat: Initial commit

Sources/SharedModels/Velocity.swift

@@ -0,0 +1,18 @@
+import Foundation
+
+public struct Velocity: Equatable {
+  public var airflow: Double
+  public var dimension: PlenumDimension
+  
+  public var value: Double {
+    airflow / dimension.areaInSquareFeet
+  }
+
+  public var flagged: Flagged { .velocity(self) }
+}
+
+extension Flagged {
+  public static func velocity(_ velocity: Velocity) -> Self {
+    .init(wrappedValue: velocity.value, .velocity())
+  }
+}