docs: add bug report issue template

- Add GitHub issue template for bug reports
- Include environment information and reproduction steps

Author: Harahan

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,55 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Before you submit an issue, please search for existing issues to avoid duplicates.**
+
+**Issue description:**
+
+Please provide a clear and concise description of your issue.
+
+**Steps to reproduce:**
+
+Please list the steps to reproduce the issue, such as:
+
+1. `command 0`
+2. `command 2`
+3. `command 3`
+4. See error
+
+**Expected behavior:**
+
+Please describe what you expected to happen.
+
+**Error logging:**
+
+If applicable, please copy and paste the error message or stack trace here. Use code blocks for better readability.
+
+**Environment:**
+
+Please provide information about your environment, such as:
+
+- [ ] Using container
+
+- OS: (Ubuntu 14.04, CentOS7)
+- GPU info:
+  - `nvidia-smi` (e.g. `NVIDIA-SMI 525.116.04   Driver Version: 525.116.04   CUDA Version: 12.0`)
+  - Graphics cards: (e.g. 4090x8)
+- Python: (e.g. CPython3.9)
+  - currently, only python>=3.9 is supported
+- GenRL: (git commit-hash)
+  - for container: `docker run --entrypoint cat --rm ghcr.io/modeltc/genrl:main /genrl/.git/refs/heads/main`
+- PyTorch: `pip show torch`
+
+**Additional context:**
+
+Please add any other context or screenshots about the issue here.
+
+**Language:**
+
+Please use English as much as possible for better communication.