Add README

packages/gulp-babili/README.md

@@ -1 +1,41 @@
 # gulp-babili
+
+## Installation
+
+```sh
+npm install gulp-babili --save-dev
+```
+
+## Usage
+
+```js
+const gulp = require("gulp");
+const babili = require("gulp-babili");
+
+gulp.task("minify", () =>
+  gulp.src("./build/app.js")
+    .pipe(babili({
+      mangle: {
+        keepClassNames: true
+      }
+    }))
+    .pipe(gulp.dest("./dist"));
+);
+```
+
+## API
+
+```js
+gulpBabili(babiliOptions, overrides);
+```
+
+### babiliOptions
+
+These are passed on to the babili preset. Refer https://github.com/babel/babili/tree/master/packages/babel-preset-babili#options. Default `{}`
+
+### Overrides
+
+Default: `{}`
+
++ `babel`: Use a custom `babel-core`
++ `babili`: Use a custom `babel-preset-babili`