feat: config file

internal/config/config.go

@@ -0,0 +1,24 @@
+package config
+
+import (
+	"github.com/knadh/koanf"
+)
+
+var (
+	K = koanf.New(".")
+)
+
+type Config struct {
+	API struct {
+		URL   string `koanf:"url"`
+		Token string `koanf:"token"`
+	} `koanf:"api"`
+}
+
+func LoadConfig(provider koanf.Provider, parser koanf.Parser) error {
+	return K.Load(provider, parser)
+}
+
+func Unmarshal(o interface{}) error {
+	return K.Unmarshal("", o)
+}