Added google sheet example

Description

Added to readme

Fixed typo

demos/README.md

@@ -43,6 +43,7 @@ can be installed with Bash on Windows or with `cygwin`.
 - [`electron application`](electron/)
 - [`nw.js application`](nwjs/)
 - [`Chrome / Chromium extensions`](chrome/)
+- [`Download a Google Sheet locally`](google-sheet/)
 - [`Adobe ExtendScript`](extendscript/)
 - [`Headless Browsers`](headless/)
 - [`canvas-datagrid`](datagrid/)

demos/google-sheet/README.md

@@ -0,0 +1,71 @@
+# Google Sheet Demo
+
+This demo is using [`drive-db`](https://github.com/franciscop/drive-db) to fetch a public Google Sheet and then `xlsx` to save the data locally as `test.xlsx`.
+
+It uses modern Javascript; `import/export`, `async/away`, etc. To run this you need Node.js 12 or newer, and you will notice we added `"type": "module"` to the `package.json`.
+
+Here is the full code:
+
+```js
+import xlsx from "xlsx";
+import drive from "drive-db";
+
+(async () => {
+  const data = await drive("1fvz34wY6phWDJsuIneqvOoZRPfo6CfJyPg1BYgHt59k");
+
+  /* Create a new workbook */
+  const workbook = xlsx.utils.book_new();
+
+  /* make worksheet */
+  const worksheet = xlsx.utils.json_to_sheet(data);
+
+  /* Add the worksheet to the workbook */
+  xlsx.utils.book_append_sheet(workbook, worksheet);
+
+  xlsx.writeFile(workbook, "test.xlsx");
+})();
+```
+
+Let's go over the different parts:
+
+```js
+import xlsx from "xlsx";
+import drive from "drive-db";
+```
+
+This imports both `xlsx` and `drive-db` libraries. While these are written in commonjs, Javascript Modules can usually import the commonjs modules with no problem.
+
+```js
+(async () => {
+  // ...
+})();
+```
+
+This is what is called an [Immediately Invoked Function Expression](https://flaviocopes.com/javascript-iife/). These are normally used to either create a new execution context, or in this case to allow to run async code easier.
+
+```js
+const data = await drive("1fvz34wY6phWDJsuIneqvOoZRPfo6CfJyPg1BYgHt59k");
+```
+
+Using `drive-db`, fetch the data for the given spreadsheet id. In this case it's [this Google Sheet document](https://docs.google.com/spreadsheets/d/1fvz34wY6phWDJsuIneqvOoZRPfo6CfJyPg1BYgHt59k/edit), and since we don't specify the sheet it's the default one.
+
+```js
+const workbook = xlsx.utils.book_new();
+const worksheet = xlsx.utils.json_to_sheet(data);
+```
+
+We need to create a workbook with a worksheet inside. The worksheet is created from the previously fetched data. `drive-db` exports the data in the same format that `xlsx`'s `.json_to_sheet()` method expects, so it's a straightforward operation.
+
+```js
+xlsx.utils.book_append_sheet(workbook, worksheet);
+```
+
+The worksheet needs to be inside the workbook, so we use the operation `.book_append_sheet()` to make it so.
+
+```js
+xlsx.writeFile(workbook, "test.xlsx");
+```
+
+Finally we save the workbook into a XLSX file in out filesystem. With this, now it can be opened by any spreadsheet program that we have installed.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)

demos/google-sheet/index.js

@@ -0,0 +1,17 @@
+import xlsx from "xlsx";
+import drive from "drive-db";
+
+(async () => {
+  const data = await drive("1fvz34wY6phWDJsuIneqvOoZRPfo6CfJyPg1BYgHt59k");
+
+  /* Create a new workbook */
+  const workbook = xlsx.utils.book_new();
+
+  /* make worksheet */
+  const worksheet = xlsx.utils.json_to_sheet(data);
+
+  /* Add the worksheet to the workbook */
+  xlsx.utils.book_append_sheet(workbook, worksheet);
+
+  xlsx.writeFile(workbook, "test.xlsx");
+})();

demos/google-sheet/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "google-sheet",
+  "version": "1.0.0",
+  "description": " This demo is using 'drive-db' to fetch a public Google Sheet and then `xlsx` to save the data locally as test.xlsx",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node ."
+  },
+  "keywords": [],
+  "author": "Francisco Presencia <public@francisco.io> (https://francisco.io/)",
+  "license": "MIT"
+}