Adding auto build

[heathhenley]

Add action to build, test, spit out the installable packages (dll/shared lib and headers) on windows and ubuntu

[heathhenley]

These are here: https://github.com/farsounder/farsounder-cpp-client/actions/runs/21883409612

Can't believe it actually built first try - testing them each completely standalone to see if it's true.

[heathhenley]

These worked completely standalone 🎉 - linking just a basic_client.cpp against them on windows and ubuntu. Probably going to make that example available too as it's a lot simpler than what's in this repo.

[Copilot]

Pull request overview

Adds a GitHub Actions workflow to automatically build, test, install (stage), and upload SDK package artifacts for Windows and Ubuntu, aligning CI with the project’s CMake install/export packaging approach.

Changes:

• Added a CI workflow to build + run tests on Windows and Ubuntu and upload staged install artifacts.
• Added validation checks to ensure the staged install contains expected binaries/headers/CMake package files/license.
• Removed the completed TODO entry about adding GitHub Actions build/test from the README.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
README.md	Removes the now-completed TODO item for GitHub Actions build/test.
.github/workflows/build-test-package.yml	New workflow to configure/build/test/install/validate and upload packaged artifacts for Windows + Ubuntu.

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[elap]

Great to have this auto building!