chore: add an issue template for bug report (#408)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,32 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+Your issue may already be reported!
+Please search on the [issue tracker](https://github.com/sashabaranov/go-openai/issues) before creating one.
+
+**Describe the bug**
+A clear and concise description of what the bug is. If it's an API-related bug, please provide relevant endpoint(s).
+
+**To Reproduce**
+Steps to reproduce the behavior, including any relevant code snippets.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots/Logs**
+If applicable, add screenshots to help explain your problem. For non-graphical issues, please provide any relevant logs or stack traces.
+
+**Environment (please complete the following information):**
+ - go-openai version: [e.g. v1.12.0]
+ - Go version: [e.g. 1.18]
+ - OpenAI API version: [e.g. v1]
+ - OS: [e.g. Ubuntu 20.04]
+
+**Additional context**
+Add any other context about the problem here.