add config

config/config.go

@@ -0,0 +1,31 @@
+package config
+
+import (
+	"os"
+)
+
+type ServerConfig struct {
+	Port string
+}
+
+type Config struct {
+	Server ServerConfig
+}
+
+func New() *Config {
+	return &Config{
+		Server: ServerConfig{
+			Port: getEnv("PORT", ""),
+		},
+	}
+}
+
+func getEnv(key string, defaultVal string) string {
+	if value, exists := os.LookupEnv(key); exists {
+		return value
+	}
+
+	return defaultVal
+}
+
+var Env = New()