docs: add issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or issue with the Forum app
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill out the information below to help us investigate.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+      placeholder: Describe the bug...
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What you expected to happen
+      placeholder: Describe what should happen...
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened
+      placeholder: Describe what actually happens...
+    validations:
+      required: true
+
+  - type: input
+    id: nextcloud-version
+    attributes:
+      label: Nextcloud Version
+      description: What version of Nextcloud are you running?
+      placeholder: e.g., 28.0.1
+    validations:
+      required: true
+
+  - type: input
+    id: app-version
+    attributes:
+      label: Forum App Version
+      description: What version of the Forum app are you using?
+      placeholder: e.g., 1.0.0
+    validations:
+      required: true
+
+  - type: input
+    id: php-version
+    attributes:
+      label: PHP Version
+      description: What version of PHP is your server running?
+      placeholder: e.g., 8.2.12
+    validations:
+      required: true
+
+  - type: dropdown
+    id: database
+    attributes:
+      label: Database
+      description: Which database are you using?
+      options:
+        - SQLite
+        - MySQL/MariaDB
+        - PostgreSQL
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: browser
+    attributes:
+      label: Browser
+      description: Which browser are you using? (if applicable)
+      placeholder: e.g., Firefox 120, Chrome 119, Safari 17
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant Logs
+      description: |
+        Please paste any relevant logs from:
+        - Nextcloud log (Settings → Logging)
+        - Browser console (F12 → Console tab)
+        - PHP error logs
+      render: shell
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots to help explain your problem
+
+  - type: textarea
+    id: additional
+    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
+contact_links:
+  - name: Nextcloud Community Forum
+    url: https://help.nextcloud.com
+    about: Ask questions and get help from the Nextcloud community
+  - name: Security Issue
+    url: https://github.com/chenasraf/nextcloud-forum/security/advisories/new
+    about: Report a security vulnerability privately

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement for the Forum app
+labels: ["enhancement"]
+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: summary
+    attributes:
+      label: Feature Summary
+      description: A brief summary of the feature you'd like to see
+      placeholder: Summarize the feature in 1-2 sentences...
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or Use Case
+      description: |
+        What problem does this feature solve? What's your use case?
+        Tip: "I'm always frustrated when..."
+      placeholder: Describe the problem or use case...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: How would you like this feature to work?
+      placeholder: Describe your proposed solution...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any alternative solutions or workarounds?
+      placeholder: Describe any alternative solutions or features you've considered...
+
+  - type: textarea
+    id: examples
+    attributes:
+      label: Examples
+      description: |
+        Are there any similar features in other apps/forums that demonstrate what you're looking for?
+      placeholder: Provide links or descriptions of similar features elsewhere...
+
+  - type: dropdown
+    id: willing-to-contribute
+    attributes:
+      label: Willing to Contribute?
+      description: Would you be willing to contribute code for this feature?
+      options:
+        - "Yes, I can submit a PR"
+        - "Maybe, with guidance"
+        - "No, but I can help test"
+        - "No"
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context, mockups, or screenshots about the feature request here