added shake to password field

XCreds/View+Shake.swift

@@ -0,0 +1,26 @@
+//
+//  NSView+Shake.swift
+//  XCreds
+//
+//  Created by Timothy Perfitt on 6/4/22.
+//
+//https://onmyway133.com/posts/how-to-shake-nsview-in-macos/
+
+import Foundation
+import Cocoa
+
+extension NSView {
+    @objc func shake(_ sender: AnyObject?) {
+        let midX = self.layer?.position.x ?? 0
+        let midY = self.layer?.position.y ?? 0
+
+        let animation = CABasicAnimation(keyPath: "position")
+        animation.duration = 0.1
+        animation.repeatCount = 2
+        animation.autoreverses = true
+        animation.fromValue = CGPoint(x: midX - 10, y: midY)
+        animation.toValue = CGPoint(x: midX + 10, y: midY)
+        self.layer?.add(animation, forKey: "position")
+    }
+
+}