update docs for options

Author: yyx990803

docs/SUMMARY.md

@@ -16,3 +16,4 @@
   - [Linting](workflow/linting.md)
   - [Testing](workflow/testing.md)
   - [Testing with Mocks](workflow/testing-with-mocks.md)
+- [Options Reference](options.md)

docs/options.md

@@ -0,0 +1,56 @@
+# Options Reference
+
+### loaders
+
+- type: `Object`
+
+  An object specifying Webpack loaders to use for language blocks inside `*.vue` files. The key corresponds to the `lang` attribute for language blocks, if specified. The default `lang` for each type is:
+
+  - `<template>`: `html`
+  - `<script>`: `js`
+  - `<style>`: `css`
+
+  For example, to use `babel-loader` and `eslint-loader` to process all `<script>` blocks:
+
+  ``` js
+  // ...
+  vue: {
+    loaders: {
+      js: 'babel!eslint'
+    }
+  }
+  ```
+
+### autoprefixer
+
+- type: `Boolean`
+- default: `true`
+
+  Whether to enable autoprefixer for CSS inside `*.vue` files.
+
+### postcss
+
+- type: `Array` or `Function`
+
+  Specify custom PostCSS plugins to be applied to CSS inside `*.vue` files. If using a function, the function will called using the same loader context and should return an Array of plugins.
+
+  ``` js
+  // ...
+  vue: {
+    // note: do not nest the `postcss` option under `loaders`
+    postcss: [require('postcss-cssnext')()],
+    autoprefixer: false,
+    loaders: {
+      // ...
+    }
+  }
+  ```
+
+### cssSourceMap
+
+- type: `Boolean`
+- default: `true`
+
+  Whether to enable source maps for CSS. Disabling this can avoid some relative path related bugs in `css-loader` and make the build a bit faster.
+
+  Note this is automatically set to `false` if the `devtool` option is not present in the main Webpack config.