docs(issue): add issue templates (#1298)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in the program
+title: "<Bug summary>"
+labels: type:Bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of the bug.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. Do this...
+2. Do that...
+3. See error here...
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Actual behavior**
+A clear and concise description of what actually happened.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment:**
+
+- OS: `e.g., Windows 11 24H2 or Arch Linux`
+- GPU: `e.g., NVIDIA GeForce RTX 4090`
+- Video2X Version: `e.g., 6.3.1`
+
+**Full command**
+If applicable, add the full command you used to run the program.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request a feature to be added or suggest an idea
+title: "<Feature summary>"
+labels: type:Enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.