[PD2] Gateway login, logout and auth middleware done.

Co-authored-by: tsousa111 <tiagao2001@hotmail.com>

Projs/PD2/internal/gateway/interface.go

@@ -0,0 +1,14 @@
+package gateway
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func readStdin(message string) string {
+	fmt.Println(message)
+	scanner := bufio.NewScanner(os.Stdin)
+	scanner.Scan()
+	return scanner.Text()
+}