✨ Add RSS widget

src/tools/shared/stopwatch.ts

@@ -0,0 +1,11 @@
+export class Stopwatch {
+  private startTime: Date;
+
+  constructor() {
+    this.startTime = new Date();
+  }
+
+  getEllapsedMilliseconds() {
+    return new Date().getTime() - this.startTime.getTime();
+  }
+}