Update docs

Author: siphomateke

README.md

@@ -85,9 +85,7 @@ Plugin options can be set inside your `vue.config.js`:
 module.exports = {
   pluginOptions: {
     browserExtension: {
-      options: {
-        // options...
-      }
+      // options...
     }
   }
 }
@@ -99,15 +97,84 @@ module.exports = {
   The browser extension components that will be managed by this plugin.
 
   Valid components are:
+  - background
   - popup
   - options
-  - contentScript
+  - contentScripts
   - standalone
+  - icons
 
   ```js
   components: {
-    popup: true,
-    contentScript: true
+    background: true,
+    contentScripts: true,
+    icons: true
+  }
+  ```
+
+- **componentOptions**
+  - Type: `Object.<string, Object>`
+
+  See [Component options](#component-options).
+
+- **manifestSync** 
+  - Type: `Array<string>` 
+  - Default: `['version']`
+  
+  Array containing names of `manifest.json` keys that will be automatically synced with `package.json` on build.
+
+  Currently, the only supported keys are `version` and `description`.
+
+### Component options
+
+Some browser extension components have additional options which can be set as follows:
+
+```js
+// vue.config.js
+module.exports = {
+  pluginOptions: {
+    browserExtension: {
+      componentOptions: {
+        // <name of component>: <options>
+        // e.g.
+        contentScripts: {
+          entries: {
+            'content1': 'src/content-script1.js',
+            'content2': 'src/content-script2.js'
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+#### background
+
+- **entry** 
+  - Type: `string|Array<string>`
+  
+  Background script as webpack entry using the [single entry shorthand syntax](https://webpack.js.org/concepts/entry-points/#single-entry-shorthand-syntax).
+
+  ```js
+  background: {
+    entry: 'src/my-background-script.js'
+  }
+  ```
+
+#### contentScripts
+
+- **entries** 
+  - Type: `{[entryChunkName: string]: string|Array<string>}`
+  
+  Content scripts as webpack entries using using the [object syntax](https://webpack.js.org/concepts/entry-points/#object-syntax).
+
+  ```js
+  contentScripts: {
+    entries: {
+      'my-first-content-script': 'src/content-script.js',
+      'my-second-content-script': 'src/my-second-script.js'
+    }
   }
   ```