添加doc预览

build/webpack.build.js

@@ -0,0 +1,13 @@
+var config = require('./webpack.config.js')
+
+config.entry = {
+  'oxygen': './src/index.js'
+}
+
+config.output = {
+  filename: './dist/[name].js',
+  library: 'Oxygen',
+  libraryTarget: 'umd'
+}
+
+module.exports = config