feat: setup repo as NPM package with edX standards.

src/Placeholder.jsx

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+import React from 'react';
+
+function Placeholder() {
+  return (
+    <div className="Placeholder">
+      <h1>
+        Under Construction
+        <br />
+        Coming Soon
+      </h1>
+    </div>
+  );
+}
+
+export default Placeholder;

src/Placeholder.test.jsx

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+import React from 'react';
+import { IntlProvider } from '@edx/frontend-platform/i18n';
+import TestRenderer from 'react-test-renderer';
+import { AppContext } from '@edx/frontend-platform/react';
+import { Context as ResponsiveContext } from 'react-responsive';
+
+import Placeholder from './index';
+
+describe('<Placeholder />', () => {
+  it('renders correctly', () => {
+    const component = (
+      <ResponsiveContext.Provider value={{ width: 1280 }}>
+        <IntlProvider locale="en" messages={{}}>
+          <AppContext.Provider
+            value={{
+              authenticatedUser: null,
+              config: {
+                LMS_BASE_URL: process.env.LMS_BASE_URL,
+                SITE_NAME: process.env.SITE_NAME,
+                LOGIN_URL: process.env.LOGIN_URL,
+                LOGOUT_URL: process.env.LOGOUT_URL,
+                LOGO_URL: process.env.LOGO_URL,
+              },
+            }}
+          >
+            <Placeholder />
+          </AppContext.Provider>
+        </IntlProvider>
+      </ResponsiveContext.Provider>
+    );
+
+    const wrapper = TestRenderer.create(component);
+
+    expect(wrapper.toJSON()).toMatchSnapshot();
+  });
+});

src/__snapshots__/Placeholder.test.jsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<Placeholder /> renders correctly 1`] = `
+<div
+  className="Placeholder"
+>
+  <h1>
+    Under Construction
+    <br />
+    Coming Soon
+  </h1>
+</div>
+`;

src/i18n/index.js

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+import arMessages from './messages/ar.json';
+// no need to import en messages-- they are in the defaultMessage field
+import es419Messages from './messages/es_419.json';
+import frMessages from './messages/fr.json';
+import kokrMessages from './messages/ko_KR.json';
+import ptbrMessages from './messages/pt_BR.json';
+import zhcnMessages from './messages/zh_CN.json';
+
+const messages = {
+  ar: arMessages,
+  'es-419': es419Messages,
+  fr: frMessages,
+  'zh-cn': zhcnMessages,
+  'ko-kr': kokrMessages,
+  'pt-br': ptbrMessages,
+};
+
+export default messages;

src/i18n/messages/ar.json

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+{
+}

src/i18n/messages/es_419.json

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+{
+}

src/i18n/messages/fr.json

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+{
+}

src/i18n/messages/ko_KR.json

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+{
+}

src/i18n/messages/pt_BR.json

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+{
+}

src/i18n/messages/zh_CN.json

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+{
+}

src/index.jsx

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+import Placeholder from './Placeholder';
+import messages from './i18n/index';
+
+export { messages };
+
+export default Placeholder;

src/index.scss

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+/* styles go here */

src/setupTest.js

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+/* eslint-disable import/no-extraneous-dependencies */
+
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+import 'babel-polyfill';
+
+Enzyme.configure({ adapter: new Adapter() });
+
+// These configuration values are usually set in webpack's EnvironmentPlugin however
+// Jest does not use webpack so we need to set these so for testing
+process.env.ACCESS_TOKEN_COOKIE_NAME = 'edx-jwt-cookie-header-payload';
+process.env.BASE_URL = 'localhost:1995';
+process.env.CREDENTIALS_BASE_URL = 'http://localhost:18150';
+process.env.CSRF_TOKEN_API_PATH = '/csrf/api/v1/token';
+process.env.ECOMMERCE_BASE_URL = 'http://localhost:18130';
+process.env.LANGUAGE_PREFERENCE_COOKIE_NAME = 'openedx-language-preference';
+process.env.LMS_BASE_URL = 'http://localhost:18000';
+process.env.LOGIN_URL = 'http://localhost:18000/login';
+process.env.LOGOUT_URL = 'http://localhost:18000/login';
+process.env.MARKETING_SITE_BASE_URL = 'http://localhost:18000';
+process.env.ORDER_HISTORY_URL = 'localhost:1996/orders';
+process.env.REFRESH_ACCESS_TOKEN_ENDPOINT = 'http://localhost:18000/login_refresh';
+process.env.SEGMENT_KEY = 'segment_whoa';
+process.env.SITE_NAME = 'edX';
+process.env.USER_INFO_COOKIE_NAME = 'edx-user-info';
+process.env.LOGO_URL = 'https://edx-cdn.org/v3/default/logo.svg';
+process.env.LOGO_TRADEMARK_URL = 'https://edx-cdn.org/v3/default/logo-trademark.svg';
+process.env.LOGO_WHITE_URL = 'https://edx-cdn.org/v3/default/logo-white.svg';
+process.env.FAVICON_URL = 'https://edx-cdn.org/v3/default/favicon.ico';