Update tweet_template.md

Author: benjagm

programs/adopters/templates/tweet_template.md

@@ -18,4 +18,14 @@ ________ is a
 
 Know more about ______ use case 💡 
 
-More about JSON Schema Adopters list ➡️ https://github.com/json-schema-org/community/blob/main/ADOPTERS.md
+More about JSON Schema Adopters list ➡️ https://github.com/json-schema-org/community/blob/main/ADOPTERS.md
+
+### Slack
+
+:mega: :tada: We are pleased to welcome ______ to the official list of :star: JSON Schema adopters :star:!
+______ is a ....
+
+Know more about JSON Schema Adopters :arrow_right: https://github.com/json-schema-org/community/blob/main/ADOPTERS.md
+Know more about _____ use case :bulb: 
+
+Is your Organization using JSON Schema? Please join the [Adopters list](https://github.com/json-schema-org/community/blob/main/ADOPTERS.md) and help us to grow the JSON Schema Ecosystem by sharing your use case.