added credential menu item add credential

src/main/java/Vault.java

@@ -138,6 +138,8 @@ public class Vault implements VaultInterface {
 
         if (input.equals("e")) {
             credentialM = false;
+        } else if (input.equals("a")) {
+            println("Type username:");
         }
     }
 }

src/test/java/VaultTest.java

@@ -44,6 +44,15 @@ public class VaultTest {
         assertFalse(vlt.credentialM);
     }
 
+    @Test
+    void openAddCredentialMenuItem() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        vlt.inputS = new ByteArrayInputStream("a".getBytes(StandardCharsets.UTF_8));
+        vlt.outputS = outputStream;
+        vlt.credentialMenu();
+        assertTrue(outputStream.toString().contains("Type"));
+    }
+
     @Test
     void addCredentialTest() { vlt.addCredential();}