because someone I know posted a photo testing a plugin and the server wad hosted/created using phpstorm?
PhpStorm has a built-in terminal. On Windows it can be opened with Alt+F12 (maybe your keymap is different). It's nothing special, just a cmd.exe terminal that displays output in the window.
I've made a short video on this; it's surely not the best or the only way to set up phpstorm with PocketMine and plugins, but it works for me :