update: gitignore

update: README.md

optimize: command /imagine

Feature: 添加FunctionCall实现向指定地址发送电子邮件 (#12)

* add: functioncall send email

* update: README.md

* update: github build ci

* register email function

* bugfix: UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-5: ordinal not in range(128)

* add: plugin debug log

* fix: sendemail error

* Returns the title and content of the message sent

Feature: 添加/prompt命令以修改用户私聊的prompt (#7)

* add: prompt command

* update: README.md && fixed #6

update: README.md