fully automate the dev setup with Gitpod.

[nisarhassan12]

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 arc repo.
• install the dependencies.
• run yarn run start.

So that anyone interested in contributing can start straight away.

You can give it a try it on my fork via this link:

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

[codecov-io]

Codecov Report

Merging #370 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #370   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          43     43           
  Lines         297    297           
  Branches       57     57           
=====================================
  Hits          297    297

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