add clipping js code

elements/ClipPath.js

@@ -0,0 +1,22 @@
+import React, {
+    Component,
+    PropTypes,
+    Children
+} from 'react-native';
+import {NativeGroup} from './G';
+
+class ClipPath extends Component{
+    static displayName = 'ClipPath';
+    static propTypes = {
+        id: PropTypes.string.isRequired
+    };
+
+    render() {
+        // TODO: 合并children路径
+        // TODO: clip-rule
+        return <NativeGroup />;
+    }
+}
+
+export default ClipPath;
+