doc: add security page and description

[shbone]

• add Security Report page and short description
• add secrity report guideline in contibution

[shbone]

TODO List

• [ ] add the security option to community secondary menu

[shbone]

Could u paster/show the screenshot in PR comment info?

Also sync the EN doc after the CN done

• add security guide page

• security report page EN version

• security report page CN version