[add] Clipboard API

Close #125
Fix #122

examples/apis/Clipboard/ClipboardExample.js

@@ -0,0 +1,33 @@
+import { Clipboard, Text, TextInput, View } from 'react-native'
+import React, { Component } from 'react';
+import { action, storiesOf } from '@kadira/storybook';
+
+class ClipboardExample extends Component {
+  render() {
+    return (
+      <View style={{ minWidth: 300 }}>
+        <Text onPress={this._handleSet}>Copy to clipboard</Text>
+        <TextInput
+          multiline={true}
+          placeholder={'Try pasting here afterwards'}
+          style={{ borderWidth: 1, height: 200, marginVertical: 20 }}
+        />
+        <Text onPress={this._handleGet}>(Clipboard.getString returns a Promise that always resolves to an empty string on web)</Text>
+      </View>
+    )
+  }
+
+  _handleGet() {
+    Clipboard.getString().then((value) => { console.log(`Clipboard value: ${value}`) });
+  }
+
+  _handleSet() {
+    const success = Clipboard.setString('This text was copied to the clipboard by React Native');
+    console.log(`Clipboard.setString success? ${success}`);
+  }
+}
+
+storiesOf('api: Clipboard', module)
+  .add('setString', () => (
+    <ClipboardExample />
+  ));