Update Gradle Scripts

library/build.gradle

@@ -0,0 +1,45 @@
+plugins {
+    // Apply the scala Plugin to add support for Scala.
+    id "scala"
+
+    // Apply the java-library plugin for API and implementation separation.
+    id "java-library"
+}
+
+group = "com.tribufu.sdk"
+version = "0.0.1"
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use Scala 2.13 in our library project
+    implementation "org.scala-lang:scala-library:2.13.3"
+
+    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
+    implementation "com.google.guava:guava:30.0-jre"
+
+    // Use Scalatest for testing our library
+    testImplementation "junit:junit:4.13.1"
+    testImplementation "org.scalatest:scalatest_2.13:3.2.3"
+    testImplementation "org.scalatestplus:junit-4-13_2.13:3.2.2.0"
+
+    // Need scala-xml at test runtime
+    testRuntimeOnly "org.scala-lang.modules:scala-xml_2.13:1.2.0"
+
+    // This dependency is exported to consumers, that is to say found on their compile classpath.
+    api "org.apache.commons:commons-math3:3.6.1"
+}
+
+tasks.named("jar") {
+    manifest {
+        attributes("Implementation-Title": project.name, "Implementation-Version": project.version)
+    }
+}
+
+java {
+    withSourcesJar()
+    withJavadocJar()
+}