Terser for Gulp (#1035)

I wrote some code that allows using the 'terser' plugin in the 'gulp' build.
There is no longer any need to use additional plugins for this.

RECIPES.md

@@ -0,0 +1,36 @@
+## Terser for Gulp
+An example of how you can use the Terser plugin in your Gulp build.
+```javascript
+const { src, dest, series } = require('gulp');
+const { minify } = require('terser');
+function js() {
+    const options = {
+        parse: {
+            bare_returns: true, // (default false) -- support top level return statements.
+            html5_comments: true, // (default true)
+            shebang: true // (default true) -- support #!command as the first line.
+        }
+    };
+    return src('app/**/*.js')
+        .on('data', function(file) {
+            async function getJs() {
+                const result = await minify(file.contents.toString(), options);
+                return await minify(result)
+            }
+            (async function() {
+                try {
+                    file.contents = Buffer.from(JSON.parse(Buffer.from(JSON.stringify(await getJs()))).code)
+                } catch (error) {
+                    const { message, line, col, pos } = error
+                    console.log('message: ' + message)
+                    console.log('filename: ' + file.basename)
+                    console.log('line: ' + line)
+                    console.log('col: ' + col)
+                    console.log('pos: ' + pos)
+                }
+            })();
+        })
+        .pipe(dest('build'))
+}
+exports.js = series(js)
+```