Update README.md

Author: sonalgoyal

README.md

@@ -117,7 +117,7 @@ Want to commit code? Please check the [contributing documentation.](https://docs
 
 ## Book Office Hours
 
-If you want to schedule a call with our team to help you understand if Zingg is the right technology for your problem, please book a slot [here](https://calendly.com/sonalgoyal/). For troubleshooting and Zingg issues, please report the problem as an issue on github. 
+If you want to schedule a call with our team to help you understand if Zingg is the right technology for your problem, please book a slot [here](https://calendly.com/sonalgoyal/). For troubleshooting and Zingg issues, please report the problem as an issue on github or join our Slack. 
 
 ## Asking questions on running Zingg