Added ragdoc for scope4j.

scope4j/build.gradle

@@ -40,11 +40,17 @@ sourceSets.main {
     }
 }
 
+configurations {
+    ragdoc
+}
+
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
     testCompile 'org.junit.platform:junit-platform-runner:1.4.2'
     testImplementation 'org.junit.jupiter:junit-jupiter-params:5.4.2'
+
+    ragdoc files('../tools/rd-builder.jar')
 }
 
 jastadd {