Add Discord server invitation (#29)

diff --git a/_data/community.yml b/_data/community.yml
index 3aa469c..59bc2dd 100644
--- a/_data/community.yml
+++ b/_data/community.yml
@@ -27,3 +27,7 @@
   des: The TVM Community conducts a number of public events, including monthly general meetings, project sub-meetings, and the annual TVM Conference. You can subscribe to the public events calendar here.
   buttonname: Calendar
   link: https://calendar.google.com/calendar/embed?src=071aaettatchrj779v0k8jsmcc%40group.calendar.google.com
+- cardname: Discord
+  des: Connect directly with TVM community members in the TVM Discord server.
+  buttonname: Discord
+  link: https://discord.gg/77Hh4jVhbM