How do you use Viper?

Viper is a popular Go library for handling configuration. To use Viper, first, import the library and create a new instance of Viper. Then, you can read configuration files (like JSON, YAML, or TOML) using methods such as ReadInConfig(), or set default values with SetDefault(). Finally, you can access your configuration values using Get() or GetString() methods as needed in your application.