Add faq for github rate limit

Author: sangee2004

docs/docs/09-faqs.md

@@ -53,3 +53,6 @@ This tells the LLM (by way of a [system message](https://platform.openai.com/doc
 
 This context also automatically shares the `sys.ls`, `sys.read`, and `sys.write` tools with the tool that is using it as a context. This is because if a tool intends to interact with the workspace, it minimally needs these tools.
 
+### I am rate limted by GitHub when executing GPTScripts. What can be done to workaround this?
+
+`GITHUB_AUTH_TOKEN` environment variable can be set to allow for GPTScripts to make authenticated github requests which will get you a higher rate limit.