Added logo and loading widget

lib/widgets/loading_widget.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'package:gap/gap.dart';
+import 'package:loading_animation_widget/loading_animation_widget.dart';
+import 'package:ocbo_esign_mobile/widgets/text_widget.dart';
+
+class LoadingWidget extends StatelessWidget {
+  final String? text;
+
+  const LoadingWidget({super.key, this.text});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        children: [
+          LoadingAnimationWidget.discreteCircle(
+            color: const Color.fromRGBO(164, 168, 229, 0.8),
+            secondRingColor: const Color.fromRGBO(141, 145, 210, 0.8),
+            thirdRingColor: const Color.fromRGBO(117, 123, 204, 0.8),
+            size: 60,
+          ),
+          const Gap(16),
+          TextWidget(text: text ?? '', size: 16, bold: true),
+        ],
+      ),
+    );
+  }
+}