Update README.md to show latest release

[nammn]

Summary

This pull request updates the README.md file to include a badge displaying the latest release version of the repository.

• README.md: Added a "Latest Release" badge to display the current release version from GitHub.

Proof of Work

https://github.com/mongodb/mongodb-kubernetes/pull/115/files?short_path=b335630#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
• Have you checked whether your jira ticket required DOCSP changes?
• Have you checked for release_note changes?

Reminder (Please remove this when merging)

• Please try to Approve or Reject Changes the PR, keep PRs in review as short as possible
• Our Short Guide for PRs: Link
• Remember the following Communication Standards - use comment prefixes for clarity:
  • blocking: Must be addressed before approval.
  • follow-up: Can be addressed in a later PR or ticket.
  • q: Clarifying question.
  • nit: Non-blocking suggestions.
  • note: Side-note, non-actionable. Example: Praise
  • --> no prefix is considered a question