Added servers list and edit server

lib/classes/process_modal.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+
+import 'package:adguard_home_manager/widgets/process_dialog.dart';
+
+class ProcessModal {
+  late BuildContext context;
+
+  ProcessModal({
+    required this.context
+  });
+
+  void open(String message) async {
+    await Future.delayed(const Duration(seconds: 0), () => {
+      showDialog(
+        context: context, 
+        builder: (c) {
+          context = c;
+          return ProcessDialog(
+            message: message,
+          );
+        },
+        barrierDismissible: false,
+        useSafeArea: true,
+      )
+    });
+  }
+
+  void close() {
+    Navigator.pop(context);
+  }
+}