Initial commit. Added pwa starter kit to project for the application.

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+/**
+@license
+Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+*/
+
+import { html } from '@polymer/lit-element';
+import { PageViewElement } from './page-view-element.js';
+import { connect } from 'pwa-helpers/connect-mixin.js';
+
+// This element is connected to the Redux store.
+import { store } from '../store.js';
+
+// These are the actions needed by this element.
+import { checkout } from '../actions/shop.js';
+
+// We are lazy loading its reducer.
+import shop, { cartQuantitySelector } from '../reducers/shop.js';
+store.addReducers({
+  shop
+});
+
+// These are the elements needed by this element.
+import './shop-products.js';
+import './shop-cart.js';
+
+// These are the shared styles needed by this element.
+import { SharedStyles } from './shared-styles.js';
+import { ButtonSharedStyles } from './button-shared-styles.js';
+import { addToCartIcon } from './my-icons.js';
+
+class MyView3 extends connect(store)(PageViewElement) {
+  _render({_quantity, _error}) {
+    return html`
+      ${SharedStyles}
+      ${ButtonSharedStyles}
+      <style>
+        /* Add more specificity (.checkout) to workaround an issue in lit-element:
+           https://github.com/PolymerLabs/lit-element/issues/34 */
+        button.checkout {
+          border: 2px solid var(--app-dark-text-color);
+          border-radius: 3px;
+          padding: 8px 16px;
+        }
+        button.checkout:hover {
+          border-color: var(--app-primary-color);
+          color: var(--app-primary-color);
+        }
+        .cart, .cart svg {
+          fill: var(--app-primary-color);
+          width: 64px;
+          height: 64px;
+        }
+        .circle.small {
+          margin-top: -72px;
+          width: 28px;
+          height: 28px;
+          font-size: 16px;
+          font-weight: bold;
+          line-height: 30px;
+        }
+      </style>
+
+      <section>
+        <h2>Redux example: shopping cart</h2>
+        <div class="cart">${addToCartIcon}<div class="circle small">${_quantity}</div></div>
+        <p>This is a slightly more advanced Redux example, that simulates a
+          shopping cart: getting the products, adding/removing items to the
+          cart, and a checkout action, that can sometimes randomly fail (to
+          simulate where you would add failure handling). </p>
+        <p>This view, as well as its 2 child elements, <code>&lt;shop-products&gt;</code> and
+        <code>&lt;shop-cart&gt;</code> are connected to the Redux store.</p>
+      </section>
+      <section>
+        <h3>Products</h3>
+        <shop-products></shop-products>
+
+        <br>
+        <h3>Your Cart</h3>
+        <shop-cart></shop-cart>
+
+        <div>${_error}</div>
+        <br>
+        <p>
+          <button class="checkout" hidden="${_quantity == 0}"
+              on-click="${() => store.dispatch(checkout())}">
+            Checkout
+          </button>
+        </p>
+      </section>
+    `;
+  }
+
+  static get properties() { return {
+    // This is the data from the store.
+    _quantity: Number,
+    _error: String
+  }}
+
+  // This is called every time something is updated in the store.
+  _stateChanged(state) {
+    this._quantity = cartQuantitySelector(state);
+    this._error = state.shop.error;
+  }
+}
+
+window.customElements.define('my-view3', MyView3);