Open in Visual Studio Code badge added

Signed-off-by: Justin J Daniel <62233773+Justinjdaniel@users.noreply.github.com>

README.md

@@ -1,5 +1,6 @@
 # ![Hyperledger Caliper](https://wiki.hyperledger.org/download/attachments/2392434/Hyperledger_Caliper_Logo_Color.svg?version=1&modificationDate=1548883186000&api=v2)
 
+[![Open in Visual Studio Code](https://open.vscode.dev/badges/open-in-vscode.svg)](https://open.vscode.dev/hyperledger/caliper)
 [![Build Status](https://travis-ci.com/hyperledger/caliper.svg?branch=master)](https://travis-ci.com/hyperledger/caliper)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/2381/badge)](https://bestpractices.coreinfrastructure.org/projects/2381)
 [![license](https://img.shields.io/badge/license-Apache%202.0-blue)](https://github.com/aklenik/caliper/blob/master/LICENSE)