Add comprehensive contribution guidelines and open source infrastructure

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or issue with the IIIF Page Viewer
+title: "[Bug]: "
+labels: ["bug", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill out the following information to help us understand and reproduce the issue.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+      placeholder: Describe what happened and what you expected to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: Please provide detailed steps to reproduce the issue.
+      placeholder: |
+        1. Go to '...'
+        2. Load IIIF manifest '...'
+        3. Click on '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: iiif-manifest
+    attributes:
+      label: IIIF Manifest URL
+      description: If the issue is related to a specific IIIF manifest, please provide the URL.
+      placeholder: https://example.com/iiif/manifest.json
+    validations:
+      required: false
+
+  - type: dropdown
+    id: browser
+    attributes:
+      label: Browser
+      description: Which browser are you using?
+      options:
+        - Chrome
+        - Firefox
+        - Safari
+        - Edge
+        - Other (specify in additional context)
+    validations:
+      required: true
+
+  - type: input
+    id: browser-version
+    attributes:
+      label: Browser Version
+      description: What version of the browser are you using?
+      placeholder: e.g., Chrome 118.0.5993.88
+    validations:
+      required: true
+
+  - type: dropdown
+    id: device
+    attributes:
+      label: Device Type
+      description: What type of device are you using?
+      options:
+        - Desktop/Laptop
+        - Mobile Phone
+        - Tablet
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: console-errors
+    attributes:
+      label: Console Errors
+      description: Please check the browser's developer console for errors and paste them here.
+      placeholder: |
+        Error: Failed to fetch manifest
+        at IIIFDataService.fetchCanvasData (iiif-data-service.js:45)
+      render: shell
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here, including screenshots if helpful.
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: testing
+    attributes:
+      label: Testing Checklist
+      description: Have you tested this issue?
+      options:
+        - label: I have tested this in multiple browsers
+        - label: I have checked the browser console for errors
+        - label: I have verified the IIIF manifest is valid (if applicable)
+        - label: I have searched existing issues for duplicates

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 💬 Questions and Discussions
+    url: https://github.com/CenterForDigitalHumanities/Page-Viewer/discussions
+    about: Ask questions and discuss ideas with the community
+  - name: 📚 IIIF Community
+    url: https://iiif.io/community/
+    about: Join the broader IIIF community for general IIIF questions
+  - name: 🔧 IIIF Technical Questions
+    url: https://groups.google.com/forum/#!forum/iiif-discuss
+    about: Technical questions about IIIF standards and implementation
+  - name: 🏛️ Center for Digital Humanities
+    url: https://digitalhumanities.wustl.edu/
+    about: Learn more about the Center for Digital Humanities at Washington University in St. Louis

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement for the IIIF Page Viewer
+title: "[Feature]: "
+labels: ["enhancement", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature! Please provide as much detail as possible to help us understand your request.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: What problem does this feature solve? Is your feature request related to a problem?
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like to see implemented.
+      placeholder: I would like to see...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternative Solutions
+      description: Describe any alternative solutions or features you've considered.
+      placeholder: Another approach could be...
+    validations:
+      required: false
+
+  - type: dropdown
+    id: feature-type
+    attributes:
+      label: Feature Type
+      description: What type of feature is this?
+      options:
+        - IIIF Standard Compliance
+        - User Interface Enhancement
+        - Accessibility Improvement
+        - Performance Optimization
+        - Developer Experience
+        - Documentation
+        - Integration/API
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority Level
+      description: How important is this feature to you?
+      options:
+        - Low - Nice to have
+        - Medium - Would be helpful
+        - High - Important for my use case
+        - Critical - Blocking my project
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: Describe your specific use case for this feature.
+      placeholder: |
+        In my digital humanities project, I need to...
+        The current workflow is...
+        This feature would help by...
+    validations:
+      required: true
+
+  - type: textarea
+    id: iiif-context
+    attributes:
+      label: IIIF Context
+      description: How does this relate to IIIF standards or best practices?
+      placeholder: This aligns with IIIF Presentation API v3 by...
+    validations:
+      required: false
+
+  - type: textarea
+    id: implementation-ideas
+    attributes:
+      label: Implementation Ideas
+      description: Do you have any ideas about how this could be implemented?
+      placeholder: |
+        This could be implemented by:
+        1. Adding a new method to...
+        2. Modifying the UI to...
+        3. Supporting additional IIIF properties...
+    validations:
+      required: false
+
+  - type: textarea
+    id: examples
+    attributes:
+      label: Examples or References
+      description: Provide links to similar features in other tools or examples of this functionality.
+      placeholder: |
+        - Similar feature in Tool X: https://example.com
+        - IIIF specification reference: https://iiif.io/api/...
+        - Example manifest that would benefit: https://...
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Contribution
+      description: Are you interested in contributing to this feature?
+      options:
+        - label: I would like to work on implementing this feature
+        - label: I can help with testing this feature
+        - label: I can provide additional IIIF manifests for testing
+        - label: I can help with documentation for this feature
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context, screenshots, or mockups about the feature request here.
+    validations:
+      required: false