[minor] add an issue template

ISSUE_TEMPLATE/1-bug-report.yml

+# modified from https://github.com/sgl-project/sglang/blob/main/.github/ISSUE_TEMPLATE/1-bug-report.yml
+name: 🐞 Bug report
+description: Create a report to help us reproduce and fix the bug
+title: "[Bug] "
+labels: ['Bug']
+
+body:
+- type: checkboxes
+  attributes:
+    label: Checklist
+    options:
+    - label: 1. I have searched for related issues and FAQs (https://github.com/mit-han-lab/nunchaku/discussions/262) but was unable to find a solution.
+    - label: 2. The issue persists in the latest version.
+    - label: 3. Please note that without environment information and a minimal reproducible example, it will be difficult for us to reproduce and address the issue, which may delay our response.
+    - label: 4. If your report is a question rather than a bug, please submit it as a discussion at https://github.com/mit-han-lab/nunchaku/discussions/new/choose. Otherwise, this issue will be closed.
+    - label: 5. If this is related to ComfyUI, please report it at https://github.com/mit-han-lab/ComfyUI-nunchaku/issues.
+    - label: 6. I will do my best to describe the issue in English.
+- type: textarea
+  attributes:
+    label: Describe the Bug
+    description: Provide a clear and concise explanation of the bug you encountered.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+      Please include relevant environment details such as your system specifications, Python version, PyTorch version, and CUDA version.
+    placeholder: "Example: Ubuntu 24.04, Python 3.11, PyTorch 2.6, CUDA 12.4"
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Reproduction Steps
+    description: |
+      What command or script did you execute? Which **model** were you using?
+    placeholder: "Example: python run_model.py --config config.json"
+  validations:
+    required: true
+

ISSUE_TEMPLATE/2-feature-request.yml

+# modified from https://github.com/sgl-project/sglang/blob/main/.github/ISSUE_TEMPLATE/2-feature-request.yml
+name: 🚀 Feature request
+description: Suggest an idea for this project
+title: "[Feature] "
+
+body:
+- type: checkboxes
+  attributes:
+    label: Checklist
+    options:
+    - label: 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/mit-han-lab/nunchaku/discussions/new/choose. Otherwise, it will be closed.
+    - label: 2. I will do my best to describe the issue in English.
+- type: textarea
+  attributes:
+    label: Motivation
+    description: |
+      A clear and concise description of the motivation of the feature.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Related resources
+    description: |
+      If there is an official code release or third-party implementations, please also provide the information here, which would be very helpful.