chore: adding add network modal storybook file

ui/pages/onboarding-flow/add-network-modal/add-network-modal.stories.tsx

@@ -0,0 +1,40 @@
+import type { Meta, StoryObj } from '@storybook/react';
+import AddNetworkModal from './index';
+
+const meta: Meta<typeof AddNetworkModal> = {
+  title: 'Pages/OnboardingFlow/AddNetworkModal',
+  component: AddNetworkModal,
+  argTypes: {
+    showHeader: { control: 'boolean' },
+    addNewNetwork: { control: 'boolean' },
+    onEditNetwork: { action: 'onEditNetwork' },
+    networkToEdit: { control: 'object' },
+    onRpcUrlAdd: { action: 'onRpcUrlAdd' },
+    prevActionMode: { control: 'text' },
+    networkFormInformation: { control: 'object' },
+    setNetworkFormInformation: { action: 'setNetworkFormInformation' },
+  },
+  args: {
+    showHeader: false,
+    addNewNetwork: true,
+    onEditNetwork: undefined,
+    networkToEdit: undefined,
+    prevActionMode: undefined,
+    networkFormInformation: {},
+    setNetworkFormInformation: () => null,
+    onRpcUrlAdd: () => {},
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof AddNetworkModal>;
+
+export const Default: Story = {
+  args: {},
+};
+
+export const ShowHeader: Story = {
+  args: {
+    showHeader: true,
+  },
+};