add and configure gulp

gulpfile.mjs

@@ -0,0 +1,36 @@
+import gulp from "gulp"
+const { watch, parallel, src, dest } = gulp
+import cssnano from "gulp-cssnano"
+import autoprefixer from "gulp-autoprefixer"
+import cssimport from "gulp-cssimport"
+import babel from "gulp-babel"
+
+function cssProcess() {
+  return src("assets/css/style.css")
+    .pipe(cssimport())
+    .pipe(
+      autoprefixer({
+        cascade: false,
+      })
+    )
+    .pipe(cssnano())
+    .pipe(dest("assets/dist"))
+}
+
+function jsProcess() {
+  return src("assets/js/script.js")
+    .pipe(
+      babel({
+        presets: ["@babel/env"],
+      })
+    )
+    .pipe(dest("assets/dist"))
+}
+
+function dev() {
+  watch("assets/css/src/*.css", cssProcess)
+}
+
+const build = parallel(cssProcess, jsProcess)
+
+export { dev, build }