add basic file structure

geometry/build.gradle

@@ -0,0 +1,41 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java library project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.7/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the java-library plugin for API and implementation separation.
+    id 'java-library'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation libs.junit.jupiter
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    // This dependency is exported to consumers, that is to say found on their compile classpath.
+    api libs.commons.math3
+
+    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
+    implementation libs.guava
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+tasks.named('test') {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}