Feature/add issue templates (#8)

* Add bug report template

* Add feature request template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: pzhu-flexiv, ZhipengZhang-flexiv
+
+---
+
+**Version information**
+- TDK: [e.g. v1.2]
+- Robot software: [e.g. v3.7]
+- OS: [e.g. Ubuntu 20.04 - x86_64]
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**
+1. '....'
+2. '....'
+3. '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for TDK
+title: "[FEATURE]"
+labels: enhancement
+assignees: pzhu-flexiv, ZhipengZhang-flexiv
+
+---
+
+**How urgent is this feature?**
+On a scale of 1 to 10.
+
+**Is your feature request related to a problem? Please describe.**
+What the problem is. E.g. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+What you want to happen.
+
+**Describe alternatives you've considered**
+Any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.