Add window9u to members

[window9u]

Membership Application Checklist

• I have pushed at least 1 commit (PR) to a Yorkie repository within the last 6 months
• I am a member of the Yorkie Discord server
• I acknowledge that I will actively participate in the Yorkie community

Contributions Summary

Link to PR(s) in Yorkie repositories:

• Use random generated key yorkie#1010
• Add all-in-one Docker Compose and Grafana configuration yorkie#997
• Implement InitialRoot option for Document attachment yorkie#986
• Set updated_at with created_at when creating Document yorkie#977
• Update updated_at only when there are operations in changes yorkie#935

Additional Information

[krapie]

Welcome!