WIP: Begins work on pdf client.

Sources/ManualDCore/FrictionRate.swift

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+/// Holds onto values returned when calculating the design
+/// friction rate for a project.
+public struct FrictionRate: Codable, Equatable, Sendable {
+  public let availableStaticPressure: Double
+  public let value: Double
+
+  public init(
+    availableStaticPressure: Double,
+    value: Double
+  ) {
+    self.availableStaticPressure = availableStaticPressure
+    self.value = value
+  }
+}