[F] Fix gradle root

build.gradle

@@ -0,0 +1,38 @@
+/*
+ * 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/7.5.1/userguide/building_java_projects.html
+ * This project uses @Incubating APIs which are subject to change.
+ */
+
+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 {
+    // This dependency is used by the application.
+    implementation 'com.google.guava:guava:31.0.1-jre'
+}
+
+testing {
+    suites {
+        // Configure the built-in test suite
+        test {
+            // Use JUnit4 test framework
+            useJUnit('4.13.2')
+        }
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'mars.assembler.App'
+}