docs: add a link to readme.md

[aliceandbob-io]

A new link is to be added to README.md which refers to the electronjs.org page.
Link to be added: https://www.electronjs.org/apps/aliceandbob-io

The link should appear in third position below the two existing links and following the same format (see below):

Download it ⬇️

• From the repo's Github page: releases
• From aliceandbobio

[shivani1120]

Hey @aliceandbob.io. I would like to work on this issue.

[aliceandbob-io]

Thanks @shivani1120! I've just assigned you the issue 🚀

[rosetanya898]

I have opened pull request #2

[aliceandbob-io]

Thanks @rosetanya898, however this issue is already assigned to @shivani1120.

[aliceandbob-io]

@shivani1120, can you confirm that you are still working on this issue? Otherwise I'll let @rosetanya898 dealing with it.

[shivani1120]

I will work on this