ci: introduce 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", "process/needs triage"]
+assignees: ''
+
+---
+
+**Describe the bug**
+Describe the issue you are experiencing here.
+Tell us what you were trying to do and what happened.
+
+**Expected behavior**
+Describe clearly and concisely what you expected to happen.
+
+**Actual behavior**
+Describe clearly and concisely what actually happened.
+
+**To Reproduce**
+Link to a small reproducer or attach an archive containing the reproducer to the issue.
+Alternatively, provide clear and concise steps to reproduce the behavior.
+
+## Environment
+
+**Timefold Solver Version or Git ref**: 
+
+**Python version used:**
+
+**Output of `uname -a` or `ver`:**
+
+## Additional information
+
+Provide any and all other information which might be relevant to the issue.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Question
+    url: https://stackoverflow.com/questions/ask?tags=timefold
+    about: Ask a question about how to use Timefold Solver.
+  - name: Discussions
+    url: https://github.com/TimefoldAI/timefold-solver/discussions/new?category=general
+    about: Open Community discussions related to Timefold Solver.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project.
+title: 'Feat: '
+labels: ["enhancement", "process/needs triage"]
+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.