Apply License File to Each Jar

Closes gh-1176

Author: jzheaux

buildSrc/src/main/groovy/io/spring/gradle/convention/SpringModulePlugin.groovy

@@ -20,6 +20,7 @@ import org.gradle.api.JavaVersion
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaLibraryPlugin
 import org.gradle.api.plugins.PluginManager
+import org.gradle.api.tasks.bundling.Jar
 import org.springframework.gradle.maven.SpringMavenPlugin
 
 /**
@@ -40,6 +41,11 @@ class SpringModulePlugin extends AbstractSpringJavaPlugin {
 		if (!Utils.isRelease(project)) {
 			deployArtifacts.dependsOn project.tasks.artifactoryPublish
 		}
+		project.tasks.withType(Jar) {
+			from(project.rootProject.files('LICENSE.txt')) {
+				into('META-INF')
+			}
+		}
 	}
 
 }