add limits

Author: ethanpalm

api-reference/chat/create-assistant-message.mdx

@@ -1,3 +1,11 @@
 ---
 openapi: POST /assistant/{domain}/message
 ---
+
+## Rate limits
+
+The assistant API has the following limits:
+
+- 10,000 uses per key per month
+- 10,000 requests per Mintlify organization per hour
+- 10,000 requests per IP per day