docs: add Latest Release badge to README (#117)

Add shields.io github/v/release badge to the first badge row.
The badge auto-updates whenever a GitHub Release is published,
showing visitors the current release version at a glance.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mpaulosky

README.md

@@ -5,6 +5,7 @@ A modern issue tracking application built with .NET Aspire, Blazor, and MongoDB.
 [![.NET 10](https://img.shields.io/badge/.NET-10-512BD4?logo=dotnet)](https://dotnet.microsoft.com/)
 [![MIT License](https://img.shields.io/badge/License-MIT-green.svg)](LICENSE)
 [![xUnit Tests](https://img.shields.io/badge/Tests-xUnit-blueviolet?logo=github)](https://github.com/mpaulosky/IssueTrackerApp/actions/workflows/squad-ci.yml)
+[![Latest Release](https://img.shields.io/github/v/release/mpaulosky/IssueTrackerApp?logo=github&color=blue&label=Release)](https://github.com/mpaulosky/IssueTrackerApp/releases/latest)
 
 [![CI/CD](https://github.com/mpaulosky/IssueTrackerApp/actions/workflows/squad-ci.yml/badge.svg)](https://github.com/mpaulosky/IssueTrackerApp/actions/workflows/squad-ci.yml)
 [![Test Suite](https://github.com/mpaulosky/IssueTrackerApp/actions/workflows/squad-test.yml/badge.svg)](https://github.com/mpaulosky/IssueTrackerApp/actions/workflows/squad-test.yml)