docs: add link to ACP FAQ docs

Author: celesteanglm

plugins/acp/README.md

@@ -262,3 +262,4 @@ To register your agent, please head over to the [agent registry](https://acp-sta
 1. [Agent Commerce Protocol (ACP) research page](https://app.virtuals.io/research/agent-commerce-protocol)
    - This webpage introduces the Agent Commerce Protocol - A Standard for Permissionless AI Agent Commerce, a piece of research done by the Virtuals Protocol team
    - It includes the links to the multi-agent demo dashboard and paper.
+2. [ACP Plugin FAQs](https://virtualsprotocol.notion.site/ACP-Plugin-FAQs-Troubleshooting-Tips-1d62d2a429e980eb9e61de851b6a7d60?pvs=4)