Update marketplace URL

Author: huytd

README.md

@@ -2,4 +2,9 @@
 
 ![](screenshot.png)
 
-Much more lighter than the Solarized Light.
+Much more lighter than the Solarized Light.
+
+## Install
+
+Download at [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=huytd.solarized-brighter-light)
+or build the extension directly [from source](https://github.com/huytd/vscode-solarized-brighter-light).