first try to add jastadd files

build.gradle

@@ -104,6 +104,10 @@ dependencies {
     testFixturesApi group: 'commons-io', name: 'commons-io', version: '2.8.0'
 }
 
+def jastaddSourceArtifact = artifacts.add('archives', file('src/main/jastadd')) {
+    // TODO configure?
+}
+
 jar {
     archiveAppendix = "base"
 }
@@ -214,6 +218,7 @@ publishing {
         maven(MavenPublication) {
             artifactId = 'preprocessor'
             from components.java
+            artifact jastaddSourceArtifact
         }
     }
     repositories {