chore: add issue form templates (#817)

.github/ISSUE_TEMPLATE/bug.yml

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+name: 🐛 Bug report
+description: Create a report to help us improve
+labels: ["bug"]
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is
+    validations:
+      required: true
+
+  - type: input
+    id: reproduce-code
+    attributes:
+      description: |
+        If possible, the best way to display an issue is by making a reproducable code snippet available at jsfiddle.  
+        Create a dotnet fiddle which reproduces your issue. You can use [this template](https://p1k.se/sharpziplib-repro) or [create a new one](https://dotnetfiddle.net/).
+      placeholder: https://dotnetfiddle.net/r39r0c0d3
+      label: Reproduction Code
+
+  - type: textarea
+    id: reproduce-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
+
+  - id: expected
+    type: textarea
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+
+  - id: operating-system
+    type: dropdown
+    attributes:
+      label: Operating System
+      multiple: true
+      options:
+        - Windows
+        - macOS
+        - Linux
+    validations:
+      required: false
+
+  - id: framework
+    type: dropdown
+    attributes:
+      label: Framework Version
+      multiple: true
+      options:
+        - .NET 7
+        - .NET 6
+        - .NET 5
+        - .NET Core v3 and earlier
+        - .NET Framework 4.x
+        - Unity
+        - Other
+    validations:
+      required: false
+
+  - id: tags
+    type: dropdown
+    attributes:
+      label: Tags
+      description: What areas are your issue related to?
+      multiple: true
+      options:
+        - ZIP
+        - GZip
+        - Tar
+        - BZip2
+        - Encoding
+        - Encryption
+        - Documentation
+        - Async
+        - Performance
+
+  - type: textarea
+    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: Ask a question
+    url: https://github.com/icsharpcode/SharpZipLib/discussions/new?category=q-a
+    about: Post any questions in QA discussions instead of creating an issue
+  - name: Discuss
+    url: https://github.com/icsharpcode/SharpZipLib/discussions/new
+    about: Discuss with other community members

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 💡 Feature request
+description: Have a new idea/feature ? Please suggest!
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: true
+
+  - id: tags
+    type: dropdown
+    attributes:
+      label: Tags
+      description: What areas are your feature request related to?
+      multiple: true
+      options:
+        - ZIP
+        - GZip
+        - Tar
+        - BZip2
+        - Encoding
+        - Encryption
+        - Documentation
+        - Async
+        - Performance
+
+  - type: textarea
+    id: extrainfo
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false

.github/workflows/issue.yml

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+name: Apply labels from issue
+
+on:
+  issues:
+    types: [opened, edited]
+
+jobs:
+  Process_Issue:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Parse Issue Forms Body
+        id: parse
+        uses: zentered/issue-forms-body-parser@v1.4.3
+      - name: Apply labels from tags
+        uses: actions/github-script@v6
+        env:
+          PARSED_DATA: "${{ steps.parse.outputs.data }}"
+        with:
+          script: |
+            const parsed = JSON.parse(process.env["PARSED_DATA"]);
+            const tags = parsed.tags.text;
+            console.log('Parsed tags:', tags);
+            const labels = tags.split(',').map( t => t.trim().toLowerCase() );
+            console.log('Applying labels:', labels);
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels,
+            })