fix: jar build

Author: JNightRider

build.gradle

@@ -5,6 +5,15 @@ plugins {
 group = 'org.nrr.nk'
 version = '1.0.0'
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+
+    withJavadocJar()
+    withSourcesJar()
+}
+
 repositories {
     mavenCentral()
 }