feat: issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a problem in the SumUp Java SDK.
+title: "[Bug]: "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug.
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: Describe the problem and what you expected to happen.
+      placeholder: A clear and concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: code
+    attributes:
+      label: Relevant code or error output
+      description: Paste a minimal code sample, stack trace, or logs if available.
+      render: java
+  - type: input
+    id: sdk-version
+    attributes:
+      label: SDK version
+      placeholder: e.g. 0.9.0
+    validations:
+      required: true
+  - type: input
+    id: java-version
+    attributes:
+      label: Java version
+      placeholder: e.g. 21.0.7
+  - type: input
+    id: build-tool
+    attributes:
+      label: Build tool
+      placeholder: e.g. Maven 3.9.9, Gradle 8.14
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      placeholder: e.g. macOS 15.5, Ubuntu 24.04
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement for the SumUp Java SDK.
+title: "[Feature]: "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for sharing your idea.
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem are you trying to solve?
+      description: Describe the current limitation or pain point.
+      placeholder: A clear and concise description of the problem.
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: Describe the change you would like to see.
+      placeholder: A clear and concise description of the desired behavior.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Describe any alternative solutions or workarounds you have considered.
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use case
+      description: Tell us how this would help you or your integration.
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other context, examples, or references here.

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question about the SumUp Java SDK.
+title: "[Question]: "
+labels:
+  - question
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Use this template for usage questions or clarification requests.
+  - type: textarea
+    id: question
+    attributes:
+      label: Your question
+      description: Describe what you are trying to do and what is unclear.
+      placeholder: Ask your question here.
+    validations:
+      required: true
+  - type: textarea
+    id: code
+    attributes:
+      label: Relevant code or context
+      description: Share any code, configuration, or API usage that would help explain the question.
+      render: java
+  - type: input
+    id: sdk-version
+    attributes:
+      label: SDK version
+      placeholder: e.g. 0.9.0
+  - type: input
+    id: java-version
+    attributes:
+      label: Java version
+      placeholder: e.g. 21.0.7
+  - type: input
+    id: build-tool
+    attributes:
+      label: Build tool
+      placeholder: e.g. Maven 3.9.9, Gradle 8.14
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any extra details that would help us answer.