docs: add office hours

README.md

@@ -6,7 +6,9 @@
 [![build status](https://img.shields.io/github/actions/workflow/status/TabbyML/tabby/ci.yml?label=build)](https://github.com/TabbyML/tabby/actions/workflows/ci.yml)
 [![Docker pulls](https://img.shields.io/docker/pulls/tabbyml/tabby)](https://hub.docker.com/r/tabbyml/tabby)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+
 [![Slack Community](https://shields.io/badge/Tabby-Join%20Slack-red?logo=slack)](https://join.slack.com/t/tabbycommunity/shared_invite/zt-1xeiddizp-bciR2RtFTaJ37RBxr8VxpA)
+[![Office Hours](https://img.shields.io/badge/book-office%20hours-purple?logo=googlecalendar&logoColor=white)](https://calendly.com/tabby_ml/chat-with-tabbyml)
 
 </div>