doc: Separate pages into sub directories.

docs/api/browser/atom-delegate.md

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+# atom-delegate
+
+The `atom-delegate` returns the delegate object for Chrome Content API. The
+atom-shell would call methods of the delegate object when the corresponding
+C++ code is called. Developers can override methods of it to control the
+underlying behaviour of the browser.
+
+An example of creating a new window when the browser is initialized:
+
+```javascript
+var delegate = require('atom-delegate');  // Delegate of Content API.
+var BrowserWindow = require('browser-window');  // Module to create native browser window.
+
+// Keep a global reference of the window object, if you don't, the window will
+// be closed automatically when the javascript object is GCed.
+var mainWindow = null;
+
+// This method will be called when atom-shell has done everything
+// initialization and ready for creating browser windows.
+delegate.browserMainParts.preMainMessageLoopRun = function() {
+  // Create the browser window,
+  mainWindow = new BrowserWindow({ width: 800, height: 600 });
+  // and load the index.html of the app.
+  mainWindow.loadUrl('file://' + __dirname + '/index.html');
+}
+```
+
+## atom-delegate.browserMainParts.preMainMessageLoopRun()
+
+Called when atom-shell has done everything initialization and ready for
+creating browser windows.