add node structure (cmd, config...)

config/config.go

@@ -0,0 +1,31 @@
+package config
+
+import (
+	"github.com/spf13/viper"
+	"github.com/urfave/cli"
+)
+
+type Config struct {
+	ID   string
+	Port string
+}
+
+var C Config
+
+func MustRead(c *cli.Context) error {
+	viper.SetConfigType("yaml")
+	viper.SetConfigName("config")
+	viper.AddConfigPath(".")
+
+	if c.GlobalString("config") != "" {
+		viper.SetConfigFile(c.GlobalString("config"))
+	}
+
+	if err := viper.ReadInConfig(); err != nil {
+		return err
+	}
+	if err := viper.Unmarshal(&C); err != nil {
+		return err
+	}
+	return nil
+}