Add contributing guidelines, issue templates, and PR template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: The tool is not doing what I expected
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+- [ ] I have reviewed this project's [contribution guidelines](https://github.com/SystemRDL/PeakRDL-regblock/blob/main/CONTRIBUTING.md)
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+Details like these can be helpful:
+* Sample SystemRDL code
+* Error message, simulation waveform, etc.
+* Version numbers for the tool, Python, and OS
+
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+
+**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: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+- [ ] I have reviewed this project's [contribution guidelines](https://github.com/SystemRDL/PeakRDL-regblock/blob/main/CONTRIBUTING.md)
+
+**Describe the problem/limitation you think should be addressed**
+A clear and concise description of what the problem is.
+
+**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 about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: I have a question
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please consider using the discussion board for more open-ended questions: https://github.com/orgs/SystemRDL/discussions

.github/pull_request_template.md

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+# Description of change
+
+Describe what bug or feature your pull request addresses.
+If applicable, provide a link to the relevant issue ticket or discussion about
+this change.
+
+# Checklist
+
+- [ ] I have reviewed this project's [contribution guidelines](https://github.com/SystemRDL/PeakRDL-regblock/blob/main/CONTRIBUTING.md)
+- [ ] This change has been tested and does not break any of the existing unit tests. (if unable to run the tests, let us know)
+- [ ] If this change adds new features, I have added new unit tests that cover them.