Fully automate dev setup with Gitpod

This commit implements a fully-automated development setup using Gitpod.io, an
online IDE for GitHub and GitLab that enables Dev-Environments-As-Code.
This makes it easy for anyone to get a ready-to-code workspace for any branch,
issue or pull request almost instantly with a single click.

README.md

@@ -1,3 +1,5 @@
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/HelloZeroNet/ZeroNet)
+
 # ZeroNet [![Build Status](https://travis-ci.org/HelloZeroNet/ZeroNet.svg?branch=py3)](https://travis-ci.org/HelloZeroNet/ZeroNet) [![Documentation](https://img.shields.io/badge/docs-faq-brightgreen.svg)](https://zeronet.io/docs/faq/) [![Help](https://img.shields.io/badge/keep_this_project_alive-donate-yellow.svg)](https://zeronet.io/docs/help_zeronet/donate/) ![tests](https://github.com/HelloZeroNet/ZeroNet/workflows/tests/badge.svg) [![Docker Pulls](https://img.shields.io/docker/pulls/nofish/zeronet)](https://hub.docker.com/r/nofish/zeronet)
 
 Decentralized websites using Bitcoin crypto and the BitTorrent network - https://zeronet.io / [onion](http://zeronet34m3r5ngdu54uj57dcafpgdjhxsgq5kla5con4qvcmfzpvhad.onion)