Update README.md

Author: acoumb

README.md

@@ -8,6 +8,8 @@ This repository houses open-source extensions, created for Umbraco Forms, that i
 
 [Hubspot](./src/Umbraco.Forms.Integrations.Crm.Hubspot/) - a custom workflow allowing form form entries to be mapped to a HubSpot contact record, and stored within the CRM platform.
 
+[ActiveCampaign](./src/Umbraco.Forms.Integrations.Crm.ActiveCampaign/) - a custom workflow allowing form entries to be mapped to an ActiveCampaign contact, and stored withing the CRM platform.
+
 ### Automation
 
 [Zapier](./src/Umbraco.Forms.Integrations.Automation.Zapier) - a dashboard interface that allows users to vizualize registered subscription hooks for their Umbraco Forms and to call Zapier triggers when a specific forms gets submitted.