Initial release

Running this WolframScript from either Wolfram Mathematica or Wolfram Engine downloads, installs and configures the IDE Eclipse 2020-06 and the Wolfram Workbench Plugin in a fully automatic way, on macOS, Windows or Linux. No Java installation is needed, since the embedded OpenJDK of Wolfram Mathematica (Engine) is used automatically. The correct Wolfram version and the dark theme are configured by default.