[Community] The description of how to introduce a new project is not full of details

the information of how to introduce a new sig is available.but if i want to introduce a new project, the description is not full of details.

otherwise, project could be inculded in a sig.or could independent, we need to discuss it .

the issue link:https://gitee.com/openeuler/community/issues/I17WWY?from=project-issue