Init vLLM Ascend maintainers info (#1124)

### What this PR does / why we need it?
As plus of https://github.com/vllm-project/vllm-ascend/pull/1070, this
patch adds `Nominating and Removing Maintainers` section (reference some
design from [PyTorch
Governance](https://docs.pytorch.org/docs/stable/community/governance.html))

Below are key info about existing maintainers:

## @wangxiyuan: 
- Super active code and high quality reviewer [450+ PR
reviewed](https://github.com/vllm-project/vllm-ascend/pulls?q=commenter%3Awangxiyuan).
- One of the top contributors, he also active contribute [50+ commits
](https://github.com/vllm-project/vllm-ascend/pulls?q=is%3Apr+is%3Aclosed+review%3Aapproved+author%3Awangxiyuan+)
with good quality, he dares to [refactor the
code](https://github.com/vllm-project/vllm-ascend/pulls?q=is%3Apr+author%3Awangxiyuan+is%3Aclosed+refactor),
which also shows his deep understanding of vllm and vllm ascend.
- He leads the [[RFC]: Hardware
pluggable](https://github.com/vllm-project/vllm/issues/11162) feature,
this make vllm-ascend project become true.
- Active community involved cross wechat group, slack, github issue.
Involved on [150+
issue](https://github.com/vllm-project/vllm-ascend/issues?q=is%3Aissue%20state%3Aopen%20commenter%3Awangxiyuan)
and help users. He is also the spearker of vLLM Beijing meetup help more
users understand vLLM Ascend.
- Relase manager of
[v0.7.1rc1](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.7.1rc1),
[v0.7.3rc1](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.7.3rc1),
[v0.7.3rc2](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.7.3rc2),
[v0.8.4rc1](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.8.4rc1),
[v0.7.3.post1](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.7.3.post1).

## @Yikun: 
- High active code reviewer: [190+ PR
reviewed](https://github.com/vllm-project/vllm-ascend/pulls?q=commenter%3AYikun),
especially for new developers to help them onboarding.
- One of the top contributors with sustained contributions: [50+
commits](https://github.com/vllm-project/vllm-ascend/pulls?q=is%3Apr+is%3Aclosed+review%3Aapproved+author%3AYikun+)
since the first day of vLLM Ascend.
- High quality contributions around vLLM compatibility guarantee and
also maintain [CI
](https://github.com/vllm-project/vllm-ascend/pull/1040) and [test
Framework](https://github.com/vllm-project/vllm-ascend/pull/730).
- Active community involved cross local group, github issue Involved on
[170+
issue](https://github.com/vllm-project/vllm-ascend/issues?q=is%3Aissue%20state%3Aopen%20commenter%3AYikun).
He is also main organizer of vLLM Beijing Meetup and speaker of [PyTorch
Day China
2025](https://pytorchdaychina2025.sched.com/event/2401V/poster-session)
to help vLLM Ascend growth.
- Relase manager of
[v0.8.4rc2](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.8.4rc2),
[v0.8.5rc1](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.8.5rc1),
[v0.7.3](https://github.com/vllm-project/vllm-ascend/releases/tag/v0.7.3).

## @ganyi1996ppo 
- High active code and high quality reviewer: [90+ PR
reviewed](https://github.com/vllm-project/vllm-ascend/pulls?q=commenter%3Aganyi1996ppo),
he has a deep understanding of Ascend operators can always find some key
issues, has deeply understand of the codebase, good code quality and
qualified judgement.
- Major and high quality contributions: [10+
commits](https://github.com/vllm-project/vllm-ascend/pulls?q=is%3Apr+is%3Aclosed+review%3Aapproved+author%3Aganyi1996ppo)
with high quality.
- He is the main contributor of [Custom AscendC op
support](https://github.com/vllm-project/vllm-ascend/pull/371),
[Deepseekv3 performance
optimization](https://github.com/vllm-project/vllm-ascend/pull/598).
- Community Involvement‌: Involved on [11+ issue and help
users](https://github.com/vllm-project/vllm-ascend/issues?q=is%3Aissue%20state%3Aopen%20commenter%3Aganyi1996ppo),
share [custom ops
topic](https://www.bilibili.com/video/BV1Z25az3EqS/?share_source=copy_web&vd_source=72ef9c665af5f2f1370abe26ce1f719f&t=1342)
on vLLM Ascend Weekly meeting.


### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Preview

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

docs/source/community/contributors.md

@@ -1,3 +1,11 @@
+# Maintainers
+
+| Name | Github ID | Date |
+|:-----------:|:-----:|:-----:|
+| Xiyuan Wang| [@wangxiyuan](https://github.com/wangxiyuan) | 2025/01 |
+| Yikun Jiang| [@Yikun](https://github.com/Yikun) | 2025/02 |
+| Yi Gan| [@ganyi1996ppo](https://github.com/ganyi1996ppo) | 2025/02 |
+
 # Contributors
 
 vLLM Ascend every release would not have been possible without the following contributors:

docs/source/community/governance.md

@@ -29,3 +29,20 @@ vLLM Ascend is an open-source project under the vLLM community, where the author
     Requires approval from existing Maintainers. The vLLM community has the final decision-making authority.
 
     Maintainer will be empowered [vllm-project/vllm-ascend](https://github.com/vllm-project/vllm-ascend) Github repo write permissions (`Can read, clone, and push to this repository. Can also manage issues and pull requests`).
+
+## Nominating and Removing Maintainers
+
+### The Principles
+
+- Membership in vLLM Ascend is given to individuals on merit basis after they demonstrated strong expertise of the vLLM / vLLM Ascend through contributions, reviews and discussions.
+
+- For membership in the maintainer group the individual has to demonstrate strong and continued alignment with the overall vLLM / vLLM Ascend principles.
+
+- Light criteria of moving module maintenance to ‘emeritus’ status if they don’t actively participate over long periods of time.
+
+- The membership is for an individual, not a company.
+
+### Nomination and Removal
+
+- Nomination: Anyone can nominate someone to become a maintainer (include self-nominate). All existing maintainers are responsible for evaluating the nomination. The nominator should provide nominee's info around the strength of the candidate to be a maintainer, include but not limited to review quality, quality contribution, community involvement.
+- Removal: Anyone can nominate a person to be removed from maintainer position (include self-nominate). All existing maintainers are responsible for evaluating the nomination. The nominator should provide nominee's info, include but not limited to lack of activity, conflict with the overall direction and other information that makes them unfit to be a maintainer.