feature: gitpod setup

[jsarenik]

My last PR was done via gitpod. I really recommend using it also for easy throw-away virtual environment where one can quickly fix something, close and do something else (without leftover stuff in home directory). It is also very useful for Chromebook-like computers.

[nwtgck]

Thanks.

Preview: https://github.com/jsarenik/piping-server-rust/tree/79eec9eb79bb0ab6ffcc7c000bc4df5aed003448

[nwtgck]

Gitpod is fantastic. I found the official extentions:

• Gitpod - Always ready to code - Chrome Web Store
• Gitpod - Always ready to code. – Get this Extension for 🦊 Firefox (en-US)

These allow you to use Gitpod for every repository.