Using Mac OS X or Linux, installation of nuclide is easy.
apm install nuclide
After installation, you can start Nuclide by opening the Atom editor. Once Atom is open, you should see the Nuclide Home page.
The left side-pane is the Nuclide Project Explorer.
The main pane contains introductory information about Nuclide and the Quick Launch Menu. This is also where you will edit your files (just like in normal Atom).
The bottom status bar shows you error and health statistics.