Add public repository community files

.github/CODEOWNERS

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+* @MikeChristensen

.github/CONTRIBUTING.md

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+# Contributing to KitchenPC Samples
+
+Thank you for contributing to KitchenPC. Please open an issue before starting a substantial change
+so the design and scope can be discussed.
+
+## Development workflow
+
+1. Fork the repository and create a focused branch from `main`.
+2. Make the smallest change that solves the issue.
+3. Add or update tests when behavior changes.
+4. Restore, build, and test before opening a pull request:
+
+   ```bash
+   dotnet restore Samples.slnx
+   dotnet build Samples.slnx --configuration Release --no-restore
+   dotnet test Samples.slnx --configuration Release --no-build --no-restore
+   cd WebApp/ClientApp
+   npm ci
+   npm run build
+   npm run lint
+   npm test
+   ```
+
+5. Open a pull request against `main` and describe both the change and how it was tested.
+
+Please do not include unrelated formatting or cleanup in a functional change. By contributing, you
+agree that your contribution will be licensed under the repository's MIT license.

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report reproducible incorrect behavior in a sample
+title: "[Bug]: "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for helping improve the KitchenPC samples.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What happened, and what did you expect instead?
+    validations:
+      required: true
+  - type: dropdown
+    id: sample
+    attributes:
+      label: Sample
+      options:
+        - React Web App
+        - Shopping List TUI
+        - Database Initializer
+        - Sample Data
+        - Repository or documentation
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Provide the smallest sequence of steps that reproduces the problem.
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include the .NET and Node.js versions, operating system, database, and other relevant details.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security vulnerability
+    url: https://github.com/KitchenPC/Samples/security/advisories/new
+    about: Report security vulnerabilities privately.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a new sample or an improvement to an existing sample
+title: "[Feature]: "
+labels:
+  - enhancement
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What developer use case should this sample or improvement demonstrate?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: Describe the application, workflow, or documentation you would like to see.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Describe any workarounds or alternative designs you considered.

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+Describe the problem and the proposed change.
+
+## Testing
+
+Describe the tests or manual checks you ran.
+
+## Checklist
+
+- [ ] The solution builds in Release mode.
+- [ ] Relevant .NET and frontend tests pass.
+- [ ] Behavioral changes include appropriate tests or documentation.
+- [ ] The change contains no unrelated formatting or cleanup.

.github/SECURITY.md

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+# Security Policy
+
+## Supported versions
+
+Security fixes are made on the latest version of the KitchenPC Samples repository.
+
+## Reporting a vulnerability
+
+Please do not disclose suspected vulnerabilities in a public issue. Use GitHub's private
+vulnerability reporting feature on this repository, or contact `support@kitchenpc.com` if private
+reporting is unavailable.
+
+Include enough detail to reproduce and assess the issue. You should receive an acknowledgement
+within seven days.