[feature] add new mock client

internal/pkg/mail/client.go

@@ -0,0 +1,15 @@
+package mail
+
+import (
+	"github.com/rs/zerolog"
+
+	"base/pkg/email"
+)
+
+type client struct {
+	logger zerolog.Logger
+}
+
+func New(logger zerolog.Logger) email.Email {
+	return &client{logger: logger}
+}