add command

adicionar comando !acaverna pras coisas

Look at existing command implementations in the codebase to understand the pattern. The issue mentions adding a command '!acaverna' but does not specify what it should do. Check the bot's command handler and see how other commands are structured. Determine the functionality needed for '!acaverna' by examining the repository's purpose or asking for clarification.

由索引模型根據 Issue 內容生成。