build: validate and publish prerelease packages

[teesofttech]

Summary

• add NuGet pack validation to CI and upload package artifacts
• add manual publish workflow inputs for version and dry-run prerelease packaging
• keep tag-based publishing, with SemVer validation in the workflow
• fail publishing clearly when NUGET_API_KEY is missing
• add MIT LICENSE and release process documentation
• update README install/release guidance

Validation

• ruby -e "require 'yaml'; YAML.load_file('.github/workflows/ci.yml'); YAML.load_file('.github/workflows/publish-nuget.yml'); puts 'yaml ok'"
• dotnet build TableauSharp.sln -c Release
• dotnet test TableauSharp.sln -c Release --no-build
• dotnet pack src/TableauSharp/TableauSharp.csproj --no-build -c Release -p:ContinuousIntegrationBuild=true -p:PackageVersion=0.1.0-alpha.1 -o ./artifacts
• inspected generated nupkg contents and nuspec metadata

Closes #25

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8c7959f8-4650-4e11-afc9-094e680ba4ab

📥 Commits

Reviewing files that changed from the base of the PR and between 7e6c6b2 and 09274bd.

📒 Files selected for processing (5)

• .github/workflows/ci.yml
• .github/workflows/publish-nuget.yml
• LICENSE
• README.md
• docs/release.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch build/nuget-prerelease-workflow

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