add missing file

damus/Util/Debouncer.swift

@@ -0,0 +1,27 @@
+//
+//  Debouncer.swift
+//  damus
+//
+//  Created by William Casarin on 2023-02-15.
+//
+
+import Foundation
+
+class Debouncer {
+    private let queue = DispatchQueue.main
+    private var workItem: DispatchWorkItem?
+    private var interval: TimeInterval
+
+    init(interval: TimeInterval) {
+        self.interval = interval
+    }
+
+    func debounce(action: @escaping () -> Void) {
+        // Cancel the previous work item if it hasn't yet executed
+        workItem?.cancel()
+
+        // Create a new work item with a delay
+        workItem = DispatchWorkItem { action() }
+        queue.asyncAfter(deadline: .now() + interval, execute: workItem!)
+    }
+}