add initial email service

internal/service/email.go

@@ -0,0 +1,32 @@
+package service
+
+import "context"
+
+type EmailParams struct {
+	From    string
+	To      []string
+	Subject string
+	Text    string
+}
+
+type EmailClient interface {
+	SendWithContext(ctx context.Context, params EmailParams) (string, error)
+}
+
+type EmailService struct {
+	client    EmailClient
+	fromEmail string
+	isDev     bool
+	appURL    string
+	appName   string
+}
+
+func NewEmailService(client EmailClient, fromEmail, appURL, appName string, isDev bool) *EmailService {
+	return &EmailService{
+		client:    client,
+		fromEmail: fromEmail,
+		isDev:     isDev,
+		appURL:    appURL,
+		appName:   appName,
+	}
+}