Update README

[VilmaNilsson]

Update our README file with ex:

• More information about our webpage
• Screenshots once we have started coding
• Release history

[trumtomte]

We will be using the AirBnB JavaScript Style Guide: https://github.com/airbnb/javascript

Commands for running it:

• npx eslint ., runs Eslint on the whole folder.
• npx eslint . --quiet, runs Eslint without warnings (we dont need to bother with these).
• npx eslint app.js, runs Eslint on a single file.

[trumtomte]

We will be using the templating engine Pug: https://pugjs.org/api/getting-started.html. This will be used by Express instead of serving plain HTML files.

Some tips for reading (you'll need to learn the syntax):

• https://pugjs.org/language/tags.html
• https://pugjs.org/language/attributes.html
• https://pugjs.org/language/includes.html
• https://pugjs.org/language/plain-text.html
• https://pugjs.org/language/interpolation.html (as we might send variables to our templates from node)

[trumtomte]

See #38 for current edits to the README (installation instructions).