Add "Open in Code" badge

Author: alexmg

README.md

@@ -2,7 +2,7 @@
 
 Multitenant application support for [Autofac IoC](https://github.com/autofac/Autofac).
 
-[![Build status](https://ci.appveyor.com/api/projects/status/9120t73i97ywdoav?svg=true)](https://ci.appveyor.com/project/Autofac/autofac-multitenant) [![codecov](https://codecov.io/gh/Autofac/Autofac.Multitenant/branch/develop/graph/badge.svg)](https://codecov.io/gh/Autofac/Autofac.Multitenant)
+[![Build status](https://ci.appveyor.com/api/projects/status/9120t73i97ywdoav?svg=true)](https://ci.appveyor.com/project/Autofac/autofac-multitenant) [![codecov](https://codecov.io/gh/Autofac/Autofac.Multitenant/branch/develop/graph/badge.svg)](https://codecov.io/gh/Autofac/Autofac.Multitenant) [![Open in Visual Studio Code](https://open.vscode.dev/badges/open-in-vscode.svg)](https://open.vscode.dev/autofac/Autofac.Multitenant)
 
 Please file issues and pull requests for this package in this repository rather than in the Autofac core repo.