add 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: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Execute '...'
+2. Send a request to '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Version**
+The version number of Easegress.
+
+**Configuration**
+* Easegress Configuration
+```yaml
+```
+
+* HTTP server configuration
+```yaml
+```
+
+* Pipeline Configuration
+```yaml
+```
+
+**Logs**
+```
+Easegress logs, if applicable.
+```
+
+**OS and Hardware**
+ - OS: [e.g. Ubuntu 20.04]
+ - CPU:[e.g. Intel(R) Core(TM) i5-8265U]
+ - Memory: [e.g. 16GB]
+
+**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 an idea for this project
+title: ''
+labels: ''
+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.