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: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Tools**
+Information on what tool (e.g. simulator or linter) you are using.
+
+**Error message/logs**
+If applicable, provide the error message or logs indicating the problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature that you find missing in VeeR
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the feature**
+A clear and concise description of the feature.
+
+**Examples**
+An optional example of the feature in some other RISC-V core, or references to documents that define it.
+
+**Additional context**
+Add any other context here.

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Q&A or other
+about: Ask a question unrelated to a specific bug or feature request
+title: ''
+labels: question
+assignees: ''
+
+---