Added doc

doc/04-debugging.md

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+# Debugging
+
+When supplying a `trace` function in `:options` it will be called with the raw maps of the request and response for allowing capturing tracing information like the raw messages sent/received:
+
+```clojure
+(create-chat-completion {:model    "gpt-3.5-turbo"
+                         :messages [{:role "system" :content "You are a helpful assistant."}
+                                    {:role "user" :content "Who won the world series in 2020?"}
+                                    {:role "assistant" :content "The Los Angeles Dodgers won the World Series in 2020."}
+                                    {:role "user" :content "Where was it played?"}]}
+                        {:trace (fn [request response]
+                                   (println (:body response)))})
+```
+
+Prints:
+
+```json
+{
+  "id": "chatcmpl-8gHB7Il500UxZPChGAZHtklLWTS8T",
+  "object": "chat.completion",
+  "created": 1705086501,
+  "model": "gpt-3.5-turbo-0613",
+  "choices": [
+    {
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "The 2020 World Series was played at Globe Life Field in Arlington, Texas."
+      },
+      "logprobs": null,
+      "finish_reason": "stop"
+    }
+  ],
+  "usage": {
+    "prompt_tokens": 53,
+    "completion_tokens": 17,
+    "total_tokens": 70
+  },
+  "system_fingerprint": null
+}
+
+```