Add Open VSX badge to README

Author: mattbsox

README.md

@@ -7,6 +7,7 @@
 > For minimum requirements information and detailed instructions on how to use Liberty Tools, check the [user-guide](docs/user-guide.md).
 
 [![Marketplace Version](https://vsmarketplacebadges.dev/version/Open-Liberty.liberty-dev-vscode-ext.png "Current Release")](https://marketplace.visualstudio.com/items?itemName=Open-Liberty.liberty-dev-vscode-ext)
+[![Open VSX](https://img.shields.io/open-vsx/v/Open-Liberty/liberty-dev-vscode-ext.png "Current Release")](https://open-vsx.org/extension/Open-Liberty/liberty-dev-vscode-ext)
 [![License](https://img.shields.io/github/license/OpenLiberty/liberty-tools-vscode.png?flat&logo=eclipse)](https://www.eclipse.org/legal/epl-2.0/)
 
 Liberty Tools for Visual Studio Code offers features for developing cloud-native Java applications with [Open Liberty](https://openliberty.io/) and [WebSphere Liberty](https://www.ibm.com/products/websphere-liberty). Iterate fast with Liberty dev mode, code with assistance for MicroProfile & Jakarta EE APIs, and easily edit Liberty configuration files.