added gulp compiling less files

sites/all/themes/gui/perfarttimeline/gulpfile.js

@@ -0,0 +1,19 @@
+var gulp = require('gulp');
+var less = require('gulp-less');
+// var watch = require('gulp-watch');
+
+function compileless() {
+  return gulp.src('./less/styles.less')  // only compile the entry file
+      // .pipe(plumber())
+      .pipe(less({
+        paths: ['./less/']
+      }))
+      // .pipe(prefix("last 8 version", "> 1%", "ie 8", "ie 7"), {cascade:true})
+      .pipe(gulp.dest('./css/'));
+      // .pipe(livereload());
+};
+gulp.task('watch', function() {
+  gulp.watch('./less/*.less', compileless);  // Watch all the .less files, then run the less task
+});
+
+gulp.task('default', gulp.series('watch')); // Default will run the 'entry' watch task