Merge pull request #72 from HubSpot/add-beta-note

Add a beta and legal terms notice

README.md

@@ -1,5 +1,6 @@
 Sample GraphQL Theme
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+:warning: This functionality is in beta and requires your account to be ungated. You can request access by submitting [this form](https://forms.gle/wQ1Rztc85gDAWUYU9). By participating in this beta you agree to HubSpot's [Developer Terms](https://legal.hubspot.com/developer-terms) & [Developer Beta Terms](https://legal.hubspot.com/developerbetaterms). Please note this functionality is currently under development and is subject to change based on testing and feedback. :warning: 
 
 This theme is based off of the CMS Starter Growth Theme. It includes modules and templates that demonstrate how to utilize GraphQL as part of a website built with HubSpot CMS and Custom CRM Objects.