📝 [webview] readme and screenshot.

webview/browser/README.md

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+# Browser
+
+A mini browser that shows the usage of [webview](https://github.com/atom/electron/blob/master/docs/api/web-view-tag.md)
+in an app.
+
+The app's main window contains a `<webview>` that is sized to fit most of it
+(via the `width` and `height` attributes). The location bar is used to
+update its `src` attribute.
+
+`<webview>` is the preferred way for you to load web content into your app. It
+runs in a separate process and has its own storage, ensuring the security and
+reliability of your application.
+
+## APIs
+
+* [webview](https://github.com/atom/electron/blob/master/docs/api/web-view-tag.md)
+
+
+## Screenshot
+![screenshot](/webview/browser/screenshot/screenshot.png)