Add help function

frenchie.txt

@@ -1,7 +1,5 @@
 [T][ ] a
-[T][ ] fk spider
 [T][ ] mom
 [T][ ] dad
 [T][ ] uncle
-[T][ ] fuck
-[T][ ] nabei
+[T][X] auntie

src/main/java/Frenchie/Command.java

@@ -10,6 +10,7 @@ public enum Command {
     event,
     invalid,
     find,
+    help,
     bye
 
 }

src/main/java/Frenchie/Frenchie.java

@@ -168,6 +168,9 @@ public String getResponse(String input) {
             output.append(ui.findMessage());
             output.append(tasks.returnMatchTasks(keyword));
             return output.toString();
+        case help:
+            output.append(ui.helpMessage());
+            return output.toString();
         default:
             return "OOPS!!! That is an invalid command!\n "
                     + "NOTE: Dates have to be entered in the dd/MM/yyyy HH:mm format!";

src/main/java/Frenchie/Parser.java

@@ -36,6 +36,8 @@ public static Command parseCommand(String input) {
             return Command.delete;
         case "find":
             return Command.find;
+        case "help":
+            return Command.help;
         default:
             return Command.invalid;
         }

src/main/java/Frenchie/Ui.java

@@ -80,6 +80,22 @@ public String findMessage() {
         return "Here are the matching tasks in your list: \n";
     }
 
+    public String helpMessage() {
+        String output = "Quickstart guide: \n"
+                + "You have 3 different tasks you can add to Frenchie: \n"
+                + "   1. todo taskname\n"
+                + "   2. deadline taskname /by dd/MM/yyyy HH:mm \n"
+                + "   3. event taskname /from dd/MM/yyyy HH:mm /to dd/MM/yyyy HH:mm \n"
+                + "Ensure you input the tasks in the above format for Frenchie to function as intended. \n"
+                + "Other functions include: \n"
+                + "list - To list all tasks stored in the TaskList \n"
+                + "mark taskIndex - mark the task of index taskIndex as done \n"
+                + "unmark taskIndex - mark the task of index taskIndex as incomplete \n"
+                + "delete taskIndex - delete the task of index taskIndex from the list \n"
+                + "find keyword - list out all tasks that contain the keyword in their task name";
+        return output;
+    }
+
     public void closeScanner() {
         scanner.close();
     }