potential split between CLI and core library

Sources/AudioTeeCore/Core/AudioPacket.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+public struct AudioPacket {
+  public let timestamp: Date
+  public let duration: Double
+  public let data: Data
+
+  public init(
+    timestamp: Date,
+    duration: Double,
+    data: Data
+  ) {
+    self.timestamp = timestamp
+    self.duration = duration
+    self.data = data
+  }
+}