feat: CI with GitHub Actions

Author: fseckel-develop

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+          cache: 'maven'
+
+      - name: Build and test with Maven
+        run: mvn -B clean verify

README.md

@@ -1,6 +1,6 @@
 # 📋 ToDoMaster - Office Tool for Task Management
 
-![Language](https://img.shields.io/badge/Language-Java%2017+-orange) ![Maven](https://img.shields.io/badge/Build-Maven-blue) ![Architecture](https://img.shields.io/badge/Architecture-MVC-purple) ![Tests](https://img.shields.io/badge/Tests-JUnit-green)
+![Language](https://img.shields.io/badge/Language-Java%2017+-orange) ![Maven](https://img.shields.io/badge/Build-Maven-blue) ![Tests](https://img.shields.io/badge/Tests-JUnit-green) ![Architecture](https://img.shields.io/badge/Architecture-MVC-purple) [![CI](https://github.com/fseckel-develop/app-todomaster-java-mvc/actions/workflows/ci.yml/badge.svg)](https://github.com/fseckel-develop/app-todomaster-java-mvc/actions/workflows/ci.yml)
 
 **TodoMaster** is a desktop **task management application** built with **Java Swing** using a clean **MVC architecture** and several classic design patterns. It allows users to organise tasks into checklists, manage priorities and deadlines, and persist data between sessions using JSON storage.