Add welcome info.

main.rb

@@ -22,6 +22,13 @@ rescue => e
   exit 1
 end
 
+puts '              ___  __   ___      ___         ___      '
+puts ' |\/| | |\ | |__  /__` |__  |\ |  |  | |\ | |__  |    '
+puts ' |  | | | \| |___ .__/ |___ | \|  |  | | \| |___ |___ '
+puts " MineSentinel dev-rolling version by S.A. [@Snoware] and owned by SCU team."
+puts " This program is licensed under Mulan PubL v2."
+puts " E-mail the author for more information: SALflake@qq.com or visit https://https://swe-iss.rth1.xyz/softwares/minesentinel."
+
 require_relative 'method_executor' # 日志系统在此时初始化
 require_relative 'server_status_detector'
 require_relative 'systemd_notifier' # 心跳系统在此时初始化