[add] support for Keyboard API

Close #625

src/apis/Keyboard/index.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2016-present, Nicolas Gallagher.
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule Keyboard
+ * @flow
+ */
+
+import dismissKeyboard from '../../modules/dismissKeyboard';
+
+const Keyboard = {
+  addListener() {},
+  dismiss() {
+    dismissKeyboard();
+  },
+  removeAllListeners() {},
+  removeListener() {}
+};
+
+export default Keyboard;

src/index.js

@@ -20,6 +20,7 @@ import {
   Easing,
   I18nManager,
   InteractionManager,
+  Keyboard,
   Linking,
   NetInfo,
   PanResponder,
@@ -85,6 +86,7 @@ const ReactNative = {
   Easing,
   I18nManager,
   InteractionManager,
+  Keyboard,
   Linking,
   NetInfo,
   PanResponder,

src/module.js

@@ -14,6 +14,7 @@ export { default as Clipboard } from './apis/Clipboard';
 export { default as Dimensions } from './apis/Dimensions';
 export { default as Easing } from 'animated/lib/Easing';
 export { default as I18nManager } from './apis/I18nManager';
+export { default as Keyboard } from './apis/Keyboard';
 export { default as InteractionManager } from './apis/InteractionManager';
 export { default as Linking } from './apis/Linking';
 export { default as NetInfo } from './apis/NetInfo';