Now is able to add meetings into the APP and the UI will show the result. Only add AddMeetingCommandParser, there are still works todo.

Author: skinnychenpi

src/test/java/seedu/address/logic/commands/FindGroupCommandTest.java

@@ -4,7 +4,7 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static seedu.address.commons.core.Messages.MESSAGE_PERSONS_LISTED_OVERVIEW;
-import static seedu.address.logic.commands.CommandTestUtil.assertCommandSuccess;
+import static seedu.address.logic.commands.persons.PersonCommandTestUtil.assertCommandSuccess;
 import static seedu.address.testutil.TypicalPersons.ALICE;
 import static seedu.address.testutil.TypicalPersons.BENSON;
 import static seedu.address.testutil.TypicalPersons.DANIEL;