Add missing link to meta topic in README (#49)

Add missing link to meta topic in README (#49)

diff --git a/README.md b/README.md
index 02fd764..4dc3387 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Discourse Cakeday!
 
+Official Plugin Topic & Documentation: https://meta.discourse.org/t/cakeday-celebrating-birthdays-and-anniversaries/38447/
+
 ![](example.png)
 ![](example2.png)
 

GitHub sha: 870cb92b

This commit appears in #49 which was approved by CvX. It was merged by CvX.