Add help command and command categories

src/main/java/wtf/beatrice/hidekobot/commands/message/InviteCommand.java

@@ -7,6 +7,7 @@ import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import net.dv8tion.jda.api.interactions.components.buttons.Button;
 import org.jetbrains.annotations.Nullable;
 import wtf.beatrice.hidekobot.commands.base.Invite;
+import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Collections;
@@ -32,6 +33,11 @@ public class InviteCommand implements MessageCommand
         return false;
     }
 
+    @Override
+    public CommandCategory getCategory() {
+        return CommandCategory.FUN;
+    }
+
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args)
     {