Add multi-file configuration read example

example/parse_multiple_files/README.md

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+# Parse multiple files for configuration
+
+This example shows how the package can be used to read from mutiple configuration files and assign them to the same structure.
+
+In this example, the configuration is read from ```db_config.yaml```,```email_config.yaml``` and ```general_config.yaml``` and the values are stored in the ```config``` struct.

example/parse_multiple_files/db_config.yaml

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+database:
+  host: "localhost"
+  user: "root"
+  password: "password"
+  name: "cleanenv"
+  port: "5432"
+  ssl_mode: "disable"

example/parse_multiple_files/email_config.yaml

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+email_service:
+  email_key: "RANDOM_KEY"
+  account_validation_template_id: "template_id"

example/parse_multiple_files/general_config.yaml

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+port: "8888"
+jwt_secret: "RANDOM_SECRET"

example/parse_multiple_files/main.go

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+package main
+
+import (
+	"log"
+
+	"github.com/ilyakaznacheev/cleanenv"
+)
+
+type config struct {
+	Port         string         `yaml:"port"`
+	JWTSecret    string         `yaml:"jwt_secret"`
+	Database     databaseConfig `yaml:"database"`
+	EmailService emailService   `yaml:"email_service"`
+}
+
+type databaseConfig struct {
+	User     string `yaml:"user"`
+	Password string `yaml:"password"`
+	Name     string `yaml:"name"`
+	Host     string `yaml:"host"`
+	Port     string `yaml:"port"`
+	SSLMode  string `yaml:"ssl_mode"`
+}
+
+type emailService struct {
+	EmailKey                    string `yaml:"email_key"`
+	AccountValidationTemplateID string `yaml:"account_validation_template_id"`
+}
+
+func main() {
+	cfg, err := ParseConfigFiles("./db_config.yaml", "./email_config.yaml", "./general_config.yaml")
+	if err != nil {
+		log.Printf("Error parsing config files: %v", err)
+		return
+	}
+
+	log.Println("Parsed Configuration")
+	log.Println(*cfg)
+
+	return
+}
+
+func ParseConfigFiles(files ...string) (*config, error) {
+	var cfg config
+
+	for i := 0; i < len(files); i++ {
+		err := cleanenv.ReadConfig(files[i], &cfg)
+		if err != nil {
+			log.Printf("Error reading configuration from file:%v", files[i])
+			return nil, err
+		}
+	}
+
+	return &cfg, nil
+}