Update README.md to show latest release (#115)

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

*
[`README.md`](diffhunk://#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R2):
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](https://docs.google.com/document/d/1T93KUtdvONq43vfTfUt8l92uo4e4SEEvFbIEKOxGr44/edit?tab=t.0)
- 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

Author: nammn

README.md

@@ -1,4 +1,5 @@
 [![Documentation](https://img.shields.io/badge/Documentation-MongoDB-green)](https://www.mongodb.com/docs/kubernetes/current/)
+![Latest Release](https://img.shields.io/github/v/release/mongodb/mongodb-kubernetes)
 
 # Mongodb Controllers for Kubernetes (MCK)