Installation instructions for using PlatformIO

PlatformIO is an open source ecosystem for IoT development with cross platform build system, library manager and full support for Espressif ESP32 development. It works on the popular host OS: Mac OS X, Windows,Linux 32/64, Linux ARM (like Raspberry Pi, BeagleBone, CubieBoard).

What is PlatformIO?
PlatformIO IDE
Quick Start with PlatformIO IDE or PlatformIO Core
Integration with Cloud and Standalone IDEs - Cloud9, Codeanywehre, Eclipse Che (Codenvy), Atom, CLion, Eclipse, Emacs, NetBeans, Qt Creator, Sublime Text, VIM and Visual Studio
Project Examples
Using "Stage" (Git) version of Arduino Core