chore: troubleshooting guide [skip ci]

Author: aallam

README.md

@@ -124,11 +124,7 @@ repositories {
 
 ## ⚠️️ Throubleshooting
 
-<details>
-  <summary>I'm seeing "The model: gpt-4 does not exist"</summary>
-
-The access to GPT-4 API is restricted at the moment. You can join the waitlist using [this form](https://openai.com/waitlist/gpt-4-api).
-</details>
+For common issues and their solutions, check the [Troubleshooting Guide](TROUBLESHOOTING.md).
 
 ## ⭐️ Support
 

TROUBLESHOOTING.md

@@ -0,0 +1,9 @@
+# Troubleshooting Guide
+
+Facing issues while using the OpenAI Kotlin API Client? Here are some common problems and their solutions.
+
+<details>
+  <summary>I'm seeing "The model: gpt-4 does not exist"</summary>
+
+The access to GPT-4 API is restricted at the moment. You can join the waitlist using [this form](https://openai.com/waitlist/gpt-4-api).
+</details>