You might want to prefer a Unix environment (Linux or macOS) for this requires a shell, mostly for npm.
First check that you have git, Node.js and npm installed (refer to the documentation).
Download the source code.
git clone <repository url>
When download is completed go to the working directory: cd PrellOne-server.
Install dependencies by running npm install.
Then install nodemon: npm install -g nodemon.
From there you can run the server with the following command:
npm run dev