Users need to click the New File button at the top of the file system to create a new contract file (currently supported file types are 'txt', 'sol',' md', 'compiled', 'deployed', 'json', 'txt', ' js', 'css', 'html', 'go', 'sum', 'mod'), here we click on the Storage.sol file, this is a very simple deposit contract prepared by ChainIDE for everyone, users can make modifications based on their requirements. Users are free to create new folders and supported files.