src: add 2x2 cube

.gradle/buildOutputCleanup/cache.properties

+#Wed Mar 17 18:48:43 CET 2021
+gradle.version=6.8.3

build.gradle

+buildscript {
+    repositories{
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.1'
+    }
+}
+
+apply plugin: 'java'
+apply plugin: 'application'
+apply plugin: 'org.junit.platform.gradle.plugin'
+
+mainClassName = 'ch.unige.cui.game.Game'
+
+sourceCompatibility = 1.8
+
+repositories{
+    mavenCentral()
+}
+
+dependencies{
+    testCompile('org.junit.jupiter:junit-jupiter-api:5.0.1')
+    testRuntime('org.junit.jupiter:junit-jupiter-engine:5.0.1')
+    testImplementation("org.junit.jupiter:junit-jupiter-api:5.0.1")
+    testCompileOnly('org.apiguardian:apiguardian-api:1.0.0')
+
+}
+
+
+task helloWorldTask{
+    doFirst{
+        print 'Hello, '
+    }
+    doLast{
+        print 'world.'
+    }
+}