Setup locally

[Akram-7869]

How to setup it locally like what is the methods can you please add that into the Readme file

[Kitenite]

Hi, the wiki is now linked in the README. We need to make this more visible perhaps. Thanks for reporting :)
https://github.com/onlook-dev/onlook?tab=readme-ov-file#installation

[SoloDevAbu]

the app is running but when i click the Play button in the toolbar then this error is showing
(node:8456) electron: Failed to load URL: http://localhost:3000/ with error: ERR_CONNECTION_REFUSED
why this error is occurring,