feat: setup gradle pour lancer l'app et les test, ajout des commandes dans le README.md

app/build.gradle

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/8.0.2/userguide/building_java_projects.html
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.1'
+
+    // This dependency is used by the application.
+    implementation 'com.google.guava:guava:31.1-jre'
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'sudoku.App'
+}
+
+test {
+    testLogging {
+        // Affiche les événements de passage, échec, saut et sortie standard/erreur
+        events "passed", "skipped", "failed", "standardOut", "standardError"
+        
+        // Affiche toujours les flux de sortie standard
+        showStandardStreams = true
+        
+        // Affiche les détails complets pour tous les événements
+        showExceptions true
+        showCauses true
+        showStackTraces true
+    }
+    useJUnitPlatform()
+}

app/src/main/java/sudoku/App.java

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+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package sudoku;
+
+public class App {
+    public String getGreeting() {
+        return "Hello World!";
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new App().getGreeting());
+    }
+}

app/src/test/java/sudoku/AppTest.java

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+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package sudoku;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class AppTest {
+    @Test
+    public void testExample() {
+        System.out.println("DOING TEST");
+        assertEquals(2 + 2, 4);
+        System.out.println("DONE TEST");   
+    }
+}