Update README.md (#1715)

Added community sign up link in the readme.

Author: JerryNixon

README.md

@@ -7,6 +7,10 @@
 
 Latest stable version of Data API builder is **0.8.51** [What's new?](https://learn.microsoft.com/azure/data-api-builder/whats-new)
 
+## Community
+
+Join the Data API builder community! This sign up will help us maintain a list of interested developers to be part of our roadmap and to help us better understand the different ways DAB is being used. Sign up [here](https://forms.office.com/pages/responsepage.aspx?id=v4j5cvGGr0GRqy180BHbR1S1JdzGAxhDrefV-tBYtwZUNE1RWVo0SUVMTkRESUZLMVVOS0wwUFNVRy4u).
+
 ## About
 
 **Data API builder for Azure Databases provides modern REST and GraphQL endpoints to your Azure Databases.**