Adding a message + fixing perm bug

plugin.yml

@@ -20,5 +20,10 @@ commands:
   hideandseek:
     description: Main HideAndSeek management command
     usage: /hideandseek <sub command> [parameters]
-permissions: []
+    permission: hideandseek.cmd
+    aliases: [hide&seek, h&s]
+permissions: 
+  hideandseek.cmd:
+    default: op
+    description: /hideandseek permission
 ...

src/Ad5001/HideAndSeek/Main.php

@@ -187,6 +187,8 @@ A
                                        $p->sendPopup("§lHider: You have 1 minute to hide yourself so seekers won't find you ! Don't get caught for " . $this->getSeekTime() . " minutes to win !");
                                    }
                                }
+                           } else {
+                               $sender->sendMessage(self::PREFIX . "§cThere must be atleast 2 players in your game to force start it.");
                            }
                            return true;
                        } else {