Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A concise description of the problem.
+
+**To Reproduce**
+Provide a minimal list of settings / codes to help us debug, such as
+- Python version
+- Version (git commit hash) of `sparc-dft-api`
+- `SPARC` C-code version (see the SPARC .out file header)
+- Your platform and architecture
+
+**Expected behavior**
+What is the code intended to achieve?
+
+**Actual output or error trace**
+Include the console output should be enough

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 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.