Add a new form-based bug report issue template (readium#431)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: File a bug report to help improve the Readium toolkit
+title: "[Bug] "
+labels: ["bug", "triage"]
+body:
+ - type: markdown
+ attributes:
+ value: |
+ Thank you for filing a bug report! Please [search for existing issues](https://github.com/readium/kotlin-toolkit/issues?q=is:issue) before submitting.
+ - type: textarea
+ id: bug-description
+ attributes:
+ label: Describe the bug
+ description: Also, please let us know what your expectations were.
+ placeholder: A clear and concise description of what the bug is.
+ validations:
+ required: true
+ - type: textarea
+ id: bug-steps
+ attributes:
+ label: How to reproduce?
+ description: |
+ Step by step explanation to reproduce the issue in the Test App.
+
+ If you can, drag and drop:
+ - the publication used to reproduce the problem, after zipping it.
+ - screenshots or a screencast showing the issue
+
+ placeholder: |
+ 1. Open book X
+ 2. Go to chapter Y
+ 3. Swipe left twice
+ 4. See error
+ ...
+ validations:
+ required: true
+ - type: input
+ id: bug-readium-version
+ attributes:
+ label: Readium version
+ description: What version of the Readium toolkit are you running?
+ validations:
+ required: true
+ - type: input
+ id: bug-api-version
+ attributes:
+ label: Android API version
+ description: On which Android API version(s) did you reproduce the problem?
+ validations:
+ required: true
+ - type: textarea
+ id: bug-additional
+ attributes:
+ label: Additional context
+ description: |
+ Share additional code showing how you use Readium, if relevant. Output logs are useful as well.
+ If you already went through the codebase to find the bug, you can explain your findings here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false