Add a link to Scalendar

Author: zainab-ali

community/index.md

@@ -128,6 +128,8 @@ Some local Scala user groups are listed on
  - [SF Scala](http://www.meetup.com/SF-Scala/)
  - [Scala Bay](https://www.meetup.com/scala-bay/)
 
+The [Scalendar](https://scalac.io/blog/) newsletter lists events each month.
+
 ### ScalaBridge
 
 Volunteers organizing free introductory Scala programming workshops for