Add Vertex AI integration repo to readme

[Yongtae723]

What does this PR do?

we add information on integration vertex ai in the README

related issue is this

Before submitting

• Did you make sure title is self-explanatory and the description concisely explains the PR?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you list all the breaking changes introduced by this pull request?
• Did you test your PR locally with pytest command?
• Did you run pre-commit hooks with pre-commit run -a command?

Did you have fun?

Make sure you had fun coding 🙃

[codecov-commenter]

Codecov Report

Base: 84.81% // Head: 84.81% // No change to project coverage 👍

Coverage data is based on head (4537724) compared to base (12cf2d1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #440   +/-   ##
=======================================
  Coverage   84.81%   84.81%           
=======================================
  Files           9        9           
  Lines         349      349           
=======================================
  Hits          296      296           
  Misses         53       53           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[ashleve]

@Yongtae723 Merged. Thank you for your contribution!