docs: add legal disclaimer to SKILL.md

Author: bendersej

agent-pdf/SKILL.md

@@ -138,3 +138,7 @@ Once the user opens the editor link, they can:
 - Rate limit: 30 requests per minute per IP
 - URL must start with http:// or https://
 - companyIdentifier must be a valid SimplePDF portal identifier
+
+## Legal
+
+SimplePDF is not responsible for the content of uploaded PDFs. By using this service, you agree that you have the right to process the documents you upload. For concerns or requests, contact support@simplepdf.com.