Added svelte example for xlsx-import

samples/xlsx-import+svelte/.gitignore

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+/node_modules/
+/public/build/
+
+.DS_Store

samples/xlsx-import+svelte/.prettierignore

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+lib
+build
+dist
+coverage
+node_modules

samples/xlsx-import+svelte/.prettierrc

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+{
+    "printWidth": 120,
+    "trailingComma": "all",
+    "singleQuote": true,
+    "tabWidth": 4
+}

samples/xlsx-import+svelte/.vscode/extensions.json

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+{
+  "recommendations": ["svelte.svelte-vscode"]
+}

samples/xlsx-import+svelte/README.md

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+# Svelte
+
+This is an example how to use `xlsx-import` in Svelte.
+
+**LIB Version:** `2.3.4`
+
+## Scripts
+
+`npm start` - compiles and hot-reloads for development
+
+`npm run build` - compiles and minifies for production
+
+`npm run test` - run cypress tests
+
+`npm run validate` - perform some checks against codebase (types, unused css, etc.)
+
+`npm run cy:open` - open cypress dashboard (server must be started before this command)
+
+## Usage
+
+```bash
+# install dependencies
+npm install
+
+# start dev server
+npm run start
+```
+
+Open the browser. Then click on "Download and parse invoice" button.
+You will see invoice file imported with xlsx-import library.
+
+## What happened
+
+1. [Invoice.xlsx](public/invoice.xlsx) fetched as Blob file
+2. Blob file transformed into ArrayBuffer and passed to [exceljs](https://www.npmjs.com/package/exceljs) in order to obtain Workbook class
+3. Workbook class then passed to Importer class of xlsx-import for mapping.
+   This is [workaround](https://github.com/Siemienik/xlsx-import/issues/4)
+   and will be fixed in [#52](https://github.com/Siemienik/xlsx-import/issues/52)
+4. After mapping invoice data rendered with [Invoice](src/components/Invoice/Invoice.svelte) component
+
+## What is worth to see here
+
+1. Study config: [`invoiceConfig.ts`](src/components/Invoice/invoiceConfig.ts)
+2. Usage package in [`App.svelte (onImportInvoice function)`](src/App.svelte)
+
+## What later
+
+1. Study documentation: [docs](./../../README.md)
+2. Start using `xlsx-import` in your project
+3. Ask a lot, report bugs and request for help: <https://github.com/Siemienik/xlsx-import/issues>
+4. [Sponsor `xlsx-import` project](https://github.com/sponsors/Siemienik)

samples/xlsx-import+svelte/cypress.json

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+{
+  "baseUrl": "http://localhost:5000",
+  "screenshotOnRunFailure": false,
+  "video": false
+}

samples/xlsx-import+svelte/cypress/integration/app_page.spec.js

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+const invoice = {
+  buyer: {
+    name: 'Bigos INC.',
+    taxIdNumber: '987654321',
+    address: 'ul. Agiede 2020, MiastoNaK',
+  },
+  date: '2020-10-08T00:00:00.000Z',
+  dueDate: '2020-10-29T00:00:00.000Z',
+  items: [
+    {
+      item: 'Mleczko do prania',
+      unitPrice: 16.45,
+      quantity: 2,
+      price: 32.9,
+    },
+    {
+      item: 'Płyn do płukania',
+      unitPrice: 14.55,
+      quantity: 1,
+      price: 14.55,
+    },
+    {
+      item: 'Pokarm dla smoka',
+      unitPrice: 79.99,
+      quantity: 10,
+      price: 799.9,
+    },
+    {
+      item: 'Instrukcja jak latać na smoku',
+      unitPrice: 19.89,
+      quantity: 1,
+      price: 19.89,
+    },
+  ],
+  seller: {
+    name: 'Krupnik LTD.',
+    taxIdNumber: '123456789',
+    address: 'ul. Usbewifi 5/G, MiastoNaK',
+    accountNo: 'PL 12 1234 1234 1234 1234 1234 1234',
+  },
+  total: 867.24,
+};
+
+describe('The App', () => {
+  it('successfully loads', () => {
+    cy.visit('/');
+  });
+
+  it('renders parsed invoice file', () => {
+    cy.visit('/');
+    cy.get('button')
+      .click()
+      .should('be.disabled');
+    cy.get('[data-qa-name="buyer-name"]').contains(invoice.buyer.name);
+    cy.get('[data-qa-name="buyer-tax-id"]').contains(invoice.buyer.taxIdNumber);
+    cy.get('[data-qa-name="buyer-address"]').contains(invoice.buyer.address);
+    invoice.items.forEach((inv, idx) => {
+      const parent = cy.get(`[data-qa-name="invoice-${idx}"]`);
+      parent.get('[data-qa-name="invoice-item"]').contains(inv.item);
+      parent.get('[data-qa-name="invoice-price"]').contains(inv.price);
+      parent.get('[data-qa-name="invoice-quantity"]').contains(inv.quantity);
+      parent.get('[data-qa-name="invoice-unit-price"]').contains(inv.unitPrice);
+    });
+    cy.get('[data-qa-name="seller-name"]').contains(invoice.seller.name);
+    cy.get('[data-qa-name="seller-tax-id"]').contains(invoice.seller.taxIdNumber);
+    cy.get('[data-qa-name="seller-address"]').contains(invoice.seller.address);
+    cy.get('[data-qa-name="seller-account"]').contains(invoice.seller.accountNo);
+    cy.get('[data-qa-name="date"]').contains(invoice.date);
+    cy.get('[data-qa-name="due-date"]').contains(invoice.dueDate);
+    cy.get('[data-qa-name="total"]').contains(invoice.total);
+  });
+});

samples/xlsx-import+svelte/cypress/plugins/index.js

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+/// <reference types="cypress" />
+// ***********************************************************
+// This example plugins/index.js can be used to load plugins
+//
+// You can change the location of this file or turn off loading
+// the plugins file with the 'pluginsFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/plugins-guide
+// ***********************************************************
+
+// This function is called when a project is opened or re-opened (e.g. due to
+// the project's config changing)
+
+/**
+ * @type {Cypress.PluginConfig}
+ */
+module.exports = (on, config) => {
+  // `on` is used to hook into various events Cypress emits
+  // `config` is the resolved Cypress config
+}

samples/xlsx-import+svelte/cypress/support/commands.js

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+// ***********************************************
+// This example commands.js shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add("login", (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add("drag", { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add("dismiss", { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This will overwrite an existing command --
+// Cypress.Commands.overwrite("visit", (originalFn, url, options) => { ... })

samples/xlsx-import+svelte/cypress/support/index.js

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+// ***********************************************************
+// This example support/index.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.js using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')