Add nextjs framework template files

code/lib/cli/rendererAssets/nextjs/js/Button.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+import './button.css';
+
+/**
+ * Primary UI component for user interaction
+ */
+export const Button = ({ primary, backgroundColor, size, label, ...props }) => {
+  const mode = primary ? 'storybook-button--primary' : 'storybook-button--secondary';
+  return (
+    <button
+      type="button"
+      className={['storybook-button', `storybook-button--${size}`, mode].join(' ')}
+      {...props}
+    >
+      {label}
+      <style jsx>{`
+        button {
+          background-color: ${backgroundColor};
+        }
+      `}</style>
+    </button>
+  );
+};
+
+Button.propTypes = {
+  /**
+   * Is this the principal call to action on the page?
+   */
+  primary: PropTypes.bool,
+  /**
+   * What background color to use
+   */
+  backgroundColor: PropTypes.string,
+  /**
+   * How large should the button be?
+   */
+  size: PropTypes.oneOf(['small', 'medium', 'large']),
+  /**
+   * Button contents
+   */
+  label: PropTypes.string.isRequired,
+  /**
+   * Optional click handler
+   */
+  onClick: PropTypes.func,
+};
+
+Button.defaultProps = {
+  backgroundColor: null,
+  primary: false,
+  size: 'medium',
+  onClick: undefined,
+};

code/lib/cli/rendererAssets/nextjs/js/Button.stories.jsx

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+import React from 'react';
+
+import { Button } from './Button';
+
+// More on default export: https://storybook.js.org/docs/react/writing-stories/introduction#default-export
+export default {
+  title: 'Example/Button',
+  component: Button,
+  // More on argTypes: https://storybook.js.org/docs/react/api/argtypes
+  argTypes: {
+    backgroundColor: { control: 'color' },
+  },
+};
+
+// More on component templates: https://storybook.js.org/docs/react/writing-stories/introduction#using-args
+const Template = (args) => <Button {...args} />;
+
+export const Primary = Template.bind({});
+// More on args: https://storybook.js.org/docs/react/writing-stories/args
+Primary.args = {
+  primary: true,
+  label: 'Button',
+};
+
+export const Secondary = Template.bind({});
+Secondary.args = {
+  label: 'Button',
+};
+
+export const Large = Template.bind({});
+Large.args = {
+  size: 'large',
+  label: 'Button',
+};
+
+export const Small = Template.bind({});
+Small.args = {
+  size: 'small',
+  label: 'Button',
+};

code/lib/cli/rendererAssets/nextjs/js/Header.jsx

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+import React from 'react';
+import PropTypes from 'prop-types';
+
+import { Button } from './Button';
+import './header.css';
+
+export const Header = ({ user, onLogin, onLogout, onCreateAccount }) => (
+  <header>
+    <div className="wrapper">
+      <div>
+        <svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+          <g fill="none" fillRule="evenodd">
+            <path
+              d="M10 0h12a10 10 0 0110 10v12a10 10 0 01-10 10H10A10 10 0 010 22V10A10 10 0 0110 0z"
+              fill="#FFF"
+            />
+            <path
+              d="M5.3 10.6l10.4 6v11.1l-10.4-6v-11zm11.4-6.2l9.7 5.5-9.7 5.6V4.4z"
+              fill="#555AB9"
+            />
+            <path
+              d="M27.2 10.6v11.2l-10.5 6V16.5l10.5-6zM15.7 4.4v11L6 10l9.7-5.5z"
+              fill="#91BAF8"
+            />
+          </g>
+        </svg>
+        <h1>Acme</h1>
+      </div>
+      <div>
+        {user ? (
+          <>
+            <span className="welcome">
+              Welcome, <b>{user.name}</b>!
+            </span>
+            <Button size="small" onClick={onLogout} label="Log out" />
+          </>
+        ) : (
+          <>
+            <Button size="small" onClick={onLogin} label="Log in" />
+            <Button primary size="small" onClick={onCreateAccount} label="Sign up" />
+          </>
+        )}
+      </div>
+    </div>
+  </header>
+);
+
+Header.propTypes = {
+  user: PropTypes.shape({}),
+  onLogin: PropTypes.func.isRequired,
+  onLogout: PropTypes.func.isRequired,
+  onCreateAccount: PropTypes.func.isRequired,
+};
+
+Header.defaultProps = {
+  user: null,
+};

code/lib/cli/rendererAssets/nextjs/js/Header.stories.jsx

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+import React from 'react';
+
+import { Header } from './Header';
+
+export default {
+  title: 'Example/Header',
+  component: Header,
+  parameters: {
+    // More on Story layout: https://storybook.js.org/docs/react/configure/story-layout
+    layout: 'fullscreen',
+  },
+};
+
+const Template = (args) => <Header {...args} />;
+
+export const LoggedIn = Template.bind({});
+LoggedIn.args = {
+  user: {
+    name: 'Jane Doe',
+  },
+};
+
+export const LoggedOut = Template.bind({});
+LoggedOut.args = {};