server.js spreadsheet tutorial

Code for the tutorial of spreadsheets. See the instructions here:

To try it:

git clone https://github.com/franciscop/server-tutorial-spreadsheet.git
cd server-tutorial-spreadsheet
npm install
npm start

Open the browser on http://localhost:3000/ and check the code in index.js.

Type	Name	Latest commit message	Commit time
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	public
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	.gitignore
	LICENSE
	README.md
	index.js
	package-lock.json
	package.json

franciscop/server-tutorial-spreadsheet