Added issue templates.

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report to help us improve
+title: "[Bug]: "
+labels: [bug, triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before moving on you should have performed enough troubleshooting to rule out common issues. For example,
+        
+        * compare the behavior with other similar projects such as NET-SNMP.
+        * capture SNMP packets with a tool like Wireshark.
+        * enable [built-in PySNMP debugging](https://www.pysnmp.com/pysnmp/examples/#using-these-examples) to see what's happening.
+        
+        If troubleshooting does not reveal very useful information or you need further assistance, please fill out the bug report below.
+        
+        To report an issue privately (such as security vulnerabilities), please write to [us](mailto:[email protected]).
+        
+        Thanks for taking the time!
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: Tell us what you expected to happen.
+      placeholder: Tell us what you expected to happen.
+      value: "I expected this,"
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: Tell us what you see!
+      placeholder: Tell us what you see!
+      value: "But a bug happened like this,"
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Detailed steps
+      description: Detailed steps to reproduce the problem.
+      placeholder: Detailed steps to reproduce the problem.
+      value: "The steps are,"
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Python package information
+      description: What version(s) of our package(s) are you using? You can usually find such information from `pip list` or `pip freeze`.
+      placeholder: xxx.0.0
+    validations:
+      required: true
+  - type: input
+    id: platform
+    attributes:
+      label: Operating system information
+      description: What version(s) of operating system(s) are you using?
+      placeholder: Windows, macOS, and/or Linux? What version(s)?
+    validations:
+      required: true
+  - type: input
+    id: python
+    attributes:
+      label: Python information
+      description: What version(s) of Python are you using?
+      placeholder: xxx.0.0
+    validations:
+      required: true
+  - type: textarea
+    id: conf
+    attributes:
+      label: (Optional) Contents of your test script
+      description: Paste the entire test script here if you didn't paste your test script above. This will be automatically formatted into code, so no need for backticks.
+      render: python
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output (for example, the error messages showed in the console). This will be automatically formatted into code, so no need for backticks.
+      render: shell

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+title: "[Feature]: "
+labels: [idea, triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        To report an issue privately, please write to [us](mailto:[email protected]).
+        
+        Thanks for taking the time!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+      placeholder: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+      placeholder: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+      placeholder: A clear and concise description of any alternative solutions or features you've considered.
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+      placeholder: Add any other context or screenshots about the feature request here.