Add gitter button to readme (#10717)

* Add gitter button to readme

diff --git a/README.md b/README.md
index 5d3aa500cf78281c8cec25348ac7a5ead20929c3..f6f4ac18c14afa15f2e3f7fe81c0040f7f040eab 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/vaadin/framework-8?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+
 # Vaadin Framework
 
 *[Vaadin Framework](https://vaadin.com/framework) allows you to build modern web apps efficiently in plain Java, without touching low level web technologies.*