Add issue templates (stfc#581)

Co-authored-by: ElliottKasoar <[email protected]>

Author: alinelena

.github/ISSUE_TEMPLATE/1_bug_report.yml

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+name: Bug report
+description: Create a report to help us improve
+labels: ["bug"]
+body:
+  - type: textarea
+    attributes:
+      label: Summary
+      description: |
+        A clear and concise description of the bug, including a minimal reproducible example.
+
+        Please include your full output with the complete error message.
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Platform
+      description: What operating system and architecture are you using? (see `uname -orsm` on Linux/MacOS)
+      placeholder: e.g., macOS 14 arm64, Windows 11 x86_64, Ubuntu 20.04 amd64
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Version
+      description: What version of janus-core are you using? (see `janus --version`)
+      placeholder: "e.g., janus-core version: 0.8.3"
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Python version
+      description: What version of Python are you using? (see `python3 --version`)
+      placeholder: e.g., Python 3.12.6
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/2_feature_request.yml

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+name: Feature request
+description: Suggest a new feature or improvement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    attributes:
+      label: Summary
+      description: |
+        A clear and concise description of what new feature or behaviour you would like to see. If applicable, please describe the current behaviour as well.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Example
+      description: Provide an example of how the user experience would change or how the new feature would be used.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Alternatives
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/3_question.yml

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+name: Question
+description: Ask a question about janus-core
+labels: ["question"]
+body:
+  - type: textarea
+    attributes:
+      label: Question
+      description: Describe your question in detail.
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Platform
+      description: What operating system and architecture are you using? (see `uname -orsm` on Linux/MacOS)
+      placeholder: e.g., macOS 14 arm64, Windows 11 x86_64, Ubuntu 20.04 amd64
+    validations:
+      required: false
+
+  - type: input
+    attributes:
+      label: Version
+      description: What version of janus-core are you using? (see `janus --version`)
+      placeholder: "e.g., janus-core version: 0.8.3"
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Documentation
+    url: https://stfc.github.io/janus-core/
+    about: Please consult the documentation before creating an issue.