chore: add name under Argo CD maintainers list

[nitishfy]

FYI argoproj/argoproj#359

Pre-submission checklist

If you're adding a new maintainer to the CSV file, please review each of these actions as well:

• The maintainer has updated their LFX Individual Dashboard profile.
• You've sent an email with the addresses to [email protected] for access to Service Desk and mailing lists.
• Optional: You've also sent a PR with updates to cncf/gitdm.

[krook]

Thank you @nitishfy,

You have been added to the CNCF maintainer list, maintainer mailing list, and Service Desk (Jira).

FYI @nate-double-u a(nother) mentee to maintainer 🎉