This will guide you to run the backend on your machine
Install java jdk 8 and Intellij:
Install PostgreSQL with default settings
After you install, open pgAdmin and conect to the localhost server with any name and host "localhost"
Right click on the server and create a ne database with the name "pc" lowercase
Right Click on Users and Roles and create a new user
Make the user with name "pcuser" and in Definition with password "pcpass" and give all the privileges
Clone the backend and open with IntelliJ AND ENABLE Auto-Import in the lower right corner