Add GitHub issue templates and PR template

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug in Featured
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for reporting a bug!
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. Configure '...'
+        2. Call '...'
+        3. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened.
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Library Version
+      placeholder: e.g. 1.0.0
+    validations:
+      required: true
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      multiple: true
+      options:
+        - Android
+        - iOS
+        - JVM
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Any other context about the problem (logs, stack traces, etc.)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions & Discussions
+    url: https://github.com/AndroidBroadcast/Featured/discussions
+    about: Ask questions and discuss ideas here instead of opening issues.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or improvement
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for suggesting an improvement!
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: What problem does this feature solve? Why is it needed?
+    validations:
+      required: true
+  - type: textarea
+    id: api
+    attributes:
+      label: Proposed API
+      description: If applicable, show what the API would look like.
+      render: kotlin
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: What other approaches did you consider?
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context

.github/pull_request_template.md

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+Closes #
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation
+- [ ] Chore / refactor
+
+## Checklist
+
+- [ ] Tests added or updated
+- [ ] Docs updated (KDoc, README, CHANGELOG)
+- [ ] `./gradlew spotlessCheck` passes
+- [ ] CHANGELOG.md updated
+
+## Notes for reviewers