Add ReactSpa template

templates/ReactSpa/ClientApp/components/About.tsx

@@ -0,0 +1,11 @@
+import * as React from 'react';
+
+export class About extends React.Component<void, void> {
+    public render() {
+        return <div>
+            <h2>About</h2>
+
+            <p>Use this area to provide additional information.</p>
+        </div>;
+    }
+}