add links to vscode market place

Author: spnraju

README.md

@@ -1,2 +1,6 @@
 # vscode-nightwatchjs-snippets
 NightwatchJS code snippets for Visual Studio Code
+
+[![Version](https://vsmarketplacebadge.apphb.com/version/xabikos.JavaScriptSnippets.svg)](https://marketplace.visualstudio.com/items?itemName=Raju.vscode-nightwatchjs-snippets)
+[![Installs](https://vsmarketplacebadge.apphb.com/installs/xabikos.JavaScriptSnippets.svg)](https://marketplace.visualstudio.com/items?itemName=Raju.vscode-nightwatchjs-snippets)
+[![Ratings](https://vsmarketplacebadge.apphb.com/rating/xabikos.JavaScriptSnippets.svg)](https://marketplace.visualstudio.com/items?itemName=Raju.vscode-nightwatchjs-snippets)