simplifies code contributions by fully automating the setup with gitpod.

[nisarhassan12]

Hi! :slightly_smiling_face:

This Pr simplifies code contributions by fully automating the dev setup with Gitpod (A free online VS Code-like IDE).

With a single click, it'll launch a workspace and automatically:

• clone the bundle-size repo.
• install all the dependencies.

So that anyone interested in contributing can start coding straight away.

You can give it a try on my fork of the repo via the link below:

https://gitpod.io/#https://github.com/nisarhassan12/bundlesize