Add Zulip badge to README.md.

README.md

@@ -18,6 +18,7 @@
 [![Commits](https://img.shields.io/github/commit-activity/m/vezel-dev/vezel-dev.github.io/master?label=commits&color=slateblue)](https://github.com/vezel-dev/vezel-dev.github.io/commits/master)
 [![Build](https://img.shields.io/github/actions/workflow/status/vezel-dev/vezel-dev.github.io/pages/pages-build-deployment?branch=master)](https://github.com/vezel-dev/vezel-dev.github.io/actions/workflows/pages/pages-build-deployment)
 [![Discord](https://img.shields.io/badge/discord-chat-7289da?logo=discord)](https://discord.gg/wtzCfaX2Nj)
+[![Zulip](https://img.shields.io/badge/zulip-chat-394069?logo=zulip)](https://vezel.zulipchat.com)
 
 </div>