add gradle wrapper and jar building

.gitignore

@@ -83,9 +83,6 @@ fabric.properties
 # Ignore Gradle GUI config
 gradle-app.setting
 
-# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
-!gradle-wrapper.jar
-
 # Cache of project
 .gradletasknamecache
 
@@ -117,3 +114,6 @@ gradle-app.setting
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+

build.gradle

@@ -1,11 +1,13 @@
 plugins {
     id 'java'
+    id 'application'
 }
 
 group 'net.lwenstrom.jan'
 version '1.0-SNAPSHOT'
 
 sourceCompatibility = 11
+targetCompatibility = 11
 
 repositories {
     mavenCentral()
@@ -23,3 +25,17 @@ dependencies {
     compile group: 'org.javatuples', name: 'javatuples', version: '1.2'
 
 }
+
+// Include dependent libraries in archive.
+mainClassName = "example.JumpingDino"
+
+
+jar {
+    manifest {
+        attributes "Main-Class": "$mainClassName"
+    }
+
+    from {
+        configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
+    }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Wed Dec 11 23:10:59 CET 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-all.zip