Welcome Gui Cao as new committer (#162)

diff --git a/content/events/welcome-gui-cao-as-new-committer/index.md b/content/events/welcome-gui-cao-as-new-committer/index.md
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+---
+title: Welcome Gui Cao as new committer
+date: 2020-12-04
+author: SkyWalking Team
+---
+
+Gui Cao begun the code contributions since May 3, 2020. 
+In the past 6 months, his 23 pull requests(GitHub, zifeihan[1]) have been accepted, which includes 5k+ lines of codes.
+
+Meanwhile, he took part in the tech discussion, and show the interests to contribute more to the project.
+
+At Dec. 4th, 2020, the project management committee(PMC) passed the proposal of promoting him as a new committer.
+He has accepted the invitation at the same day.
+
+Welcome Gui Gao join the committer team.
+
+[1] https://github.com/apache/skywalking/commits?author=zifeihan
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diff --git a/content/team/_index.md b/content/team/_index.md
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 | Name              | Apache ID  |
 |-------------------|------------|
 | Brandon Fergerson | bfergerson |
+| Gui Cao           | zifeihan   |
 | Huaxi Jiang       | hoshea     |
 | Jiapeng Liu       | liujiapeng |
 | JunXu Chen        | chenjunxu  |