Prepare NuGet package metadata and release workflow

[teesofttech]

Summary

Adds the missing metadata and release workflow pieces needed before publishing the SDK to NuGet.

What changed

• Changed the NuGet package ID to Termii.SDK while keeping the assembly/namespace as Termii.
• Added VersionPrefix 0.1.0 and package release notes.
• Added package README inclusion so NuGet no longer warns about a missing readme.
• Added MIT LICENSE.
• Added SourceLink, symbols, repository metadata, and deterministic CI build metadata.
• Added docs/RELEASING.md with release checklist and required secret documentation.
• Added a tag/manual release workflow that restores, builds, tests, packs, uploads artifacts, and publishes only when NUGET_API_KEY is configured.
• Updated CI artifact upload to include symbol packages.
• Updated README install instructions and license section.
• Updated API coverage statuses for Implement Messaging API: send SMS and channel messages #7, Prepare NuGet package metadata and publishing workflow #8, and Configure CI for build, test, format, and package validation #11.

Validation

• dotnet restore Termii.SDK.sln
• dotnet build Termii.SDK.sln --configuration Release --no-restore
• dotnet test tests/Termii.Tests/Termii.Tests.csproj --configuration Release --no-build --logger "trx;LogFileName=unit-tests.trx"
• dotnet test tests/Termii.IntegrationTests/Termii.IntegrationTests.csproj --configuration Release --no-build --logger "trx;LogFileName=integration-tests.trx"
• dotnet pack src/Termii/Termii.csproj --configuration Release --no-build --output artifacts/packages

Pack created:

• Termii.SDK.0.1.0.nupkg
• Termii.SDK.0.1.0.snupkg

Closes #8

Summary by CodeRabbit

• New Features

  • Added automated release workflow for publishing the SDK to NuGet.

• Documentation

  • Updated README with installation instructions and CI build status badge.
  • Added comprehensive release process documentation.
  • Added MIT License information.
  • Updated API coverage tracking for implemented endpoints and features.

• Chores

  • Configured NuGet package metadata and versioning (v0.1.0).
  • Enhanced CI workflow for artifact handling.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 008fbd02-7279-4099-a71d-884a2546b17c

📥 Commits

Reviewing files that changed from the base of the PR and between 8a3f824 and f4e779b.

📒 Files selected for processing (8)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• Directory.Build.props
• LICENSE
• README.md
• docs/API_COVERAGE.md
• docs/RELEASING.md
• src/Termii/Termii.csproj

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📝 Walkthrough

Walkthrough

This PR adds complete NuGet packaging support to the SDK, including project metadata configuration, build properties, automated release workflow, and comprehensive documentation. The changes enable building, testing, packing, and conditionally publishing the SDK to NuGet.org.

Changes

NuGet Package Publishing Preparation

Layer / File(s)	Summary
Project packaging metadata and build properties src/Termii/Termii.csproj, Directory.Build.props	PackageId changed to Termii.SDK, VersionPrefix set to 0.1.0, and Microsoft.SourceLink.GitHub added. Project file includes README in package root. Build properties enable symbol packaging, license acceptance, repository URL embedding, CI build detection, and source embedding.
Release workflow and CI packaging .github/workflows/ci.yml, .github/workflows/release.yml	CI artifact upload now includes .snupkg files. New Release workflow triggers on version tags (v*.*.*) and manual dispatch, building in Release mode, running separate unit and integration test steps, packing to artifacts/packages/, uploading artifacts, and conditionally publishing to NuGet when triggered by tag push or manual publish input with NUGET_API_KEY present.
Release documentation, licensing, and project metadata updates LICENSE, README.md, docs/RELEASING.md, docs/API_COVERAGE.md	MIT License file added with Teesoft Tech copyright. README adds CI badge, package installation command under Usage, and License section. RELEASING.md documents semantic versioning, VersionPrefix alignment, release checklist, and NUGET_API_KEY requirement. API_COVERAGE.md marks CI build/test/packaging and three messaging endpoints as Implemented, NuGet metadata workflow as In progress.

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🎯 2 (Simple) | ⏱️ ~12 minutes

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🐰 A package hops onto the shelf so bright,
With versioning rules and workflows tight,
CI builds and tests, then off it goes,
To NuGet's home—the SDK flows!
Licensing clear, docs complete with care, ✨📦

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/8-nuget-package-metadata

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