feat: Adds airflow at pressure feature.

Sources/AirflowAtPressureFeature/InfoView.swift

@@ -0,0 +1,44 @@
+import SwiftUI
+
+struct AirflowAtPressureInfoView: View {
+
+  static let heading = """
+  Calculate the airflow at the target pressure from the existing airflow and existing pressure.
+  """
+
+  static let body = """
+  This can be useful to determine the effect of a different blower speed on a specific measurement location (generally the supply or return plenum).
+  """
+
+  var body: some View {
+    VStack(spacing: 40) {
+
+      ZStack {
+        Text(Self.heading)
+          .font(.headline)
+          .bold()
+          .foregroundStyle(Color.white)
+          .padding()
+      }
+      .background {
+        RoundedRectangle(cornerRadius: 10)
+          .foregroundStyle(Color.orange.opacity(0.6))
+      }
+
+
+      ZStack {
+        Text(Self.body)
+          .font(.callout)
+          .padding()
+      }
+      .background {
+        RoundedRectangle(cornerRadius: 10)
+          .foregroundStyle(Color.secondary.opacity(0.3))
+      }
+      .padding(.horizontal, 10)
+
+      Spacer()
+    }
+    .padding(.horizontal)
+  }
+}