package main import ( "fmt" "github.com/cloudfoundry/cli/cf/configuration/core_config" "os" ) func main() { // create a new instance of the core config readwriter config := core_config.NewReadWriter() // set configuration parameters config.SetAPIEndpoint("https://api.example.com") config.SetPassword("PASSWORD") config.SetUsername("USERNAME") // save configuration data to file err := config.Save(os.Getenv("HOME") + "/.cf/config.json") if err != nil { fmt.Println(err) } // load configuration data from file err = config.Load(os.Getenv("HOME") + "/.cf/config.json") if err != nil { fmt.Println(err) } // print configuration parameters fmt.Println("API endpoint:", config.APIEndpoint()) fmt.Println("Username:", config.Username()) fmt.Println("Password:", config.Password()) }In this example, we create a new instance of the core config readwriter and set the configuration parameters using the `SetAPIEndpoint`, `SetPassword`, and `SetUsername` methods. We then save the configuration data to a file using the `Save` method. Next, we load the configuration data from the file using the `Load` method and print the configuration parameters using the `APIEndpoint`, `Username`, and `Password` methods. Therefore, this example code demonstrates one of the ways to interact with the core_config package in the github.com.cloudfoundry.cli.cf.configuration library.