gradle introduced, unit tests set up

.gitattributes

@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+

.gitignore

@@ -23,4 +23,9 @@
 hs_err_pid*
 replay_pid*
 
-.idea
+.idea
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    id("org.jetbrains.kotlin.jvm") version "1.7.10"
+
+    // Apply the java-library plugin for API and implementation separation.
+    `java-library`
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    implementation("com.zaxxer:HikariCP:7.0.2")
+    implementation("org.postgresql:postgresql:42.7.9")
+    implementation("com.fasterxml.jackson.core:jackson-databind:2.17.1")
+    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.17.1")
+    implementation("com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.17.1")
+    implementation("com.google.guava:guava:32.1.3-jre")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.9.2")
+    testImplementation("org.assertj:assertj-core:3.24.2")
+}
+
+testing {
+    suites {
+        val test by getting(JvmTestSuite::class) {
+            useJUnitJupiter("5.9.2")
+        }
+    }
+}

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "appendix"