Add issue template

.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.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Which version of Oxigraph are you using? On which platform?
+2. A command line or a code snippet that triggers the bug.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+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**
+Please link to other systems implementing the feature, specification of it if it exists and/or existing documentation about this feature.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Please don't use issues but the Q&A section of the "discussions" space
+title: ''
+labels: question
+assignees: ''
+
+---
+
+