feat: able to add more UI theme (#860)

web/default/src/components/Loading.js

@@ -0,0 +1,14 @@
+import React from 'react';
+import { Segment, Dimmer, Loader } from 'semantic-ui-react';
+
+const Loading = ({ prompt: name = 'page' }) => {
+  return (
+    <Segment style={{ height: 100 }}>
+      <Dimmer active inverted>
+        <Loader indeterminate>加载{name}中...</Loader>
+      </Dimmer>
+    </Segment>
+  );
+};
+
+export default Loading;