Added vcpkg installation docs and CI smoke test #54

	# Cross-platform / multi-compiler build & test.
	#
	# Configures, builds, and runs the full test suite (unit tests + examples
	# registered as ctest) on:
	# - Ubuntu (gcc and clang)
	# - macOS (AppleClang)
	# - Windows (MSVC)
	#
	# Triggered automatically on push/PR to master/main; can also be run manually
	# from the Actions tab in GitHub UI.

	name: CI

	on:
	push:
	branches: [master, main]
	pull_request:
	branches: [master, main]
	workflow_dispatch:

	permissions:
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	test:
	name: ${{ matrix.name }}
	strategy:
	fail-fast: false
	matrix:
	include:
	- name: ubuntu-gcc
	os: ubuntu-latest
	cc: gcc
	cxx: g++
	- name: ubuntu-clang
	os: ubuntu-latest
	cc: clang
	cxx: clang++
	- name: macos
	os: macos-latest
	- name: windows
	os: windows-latest

	runs-on: ${{ matrix.os }}

	env:
	CC: ${{ matrix.cc }}
	CXX: ${{ matrix.cxx }}

	steps:
	- uses: actions/checkout@v4

	- name: Cache FetchContent dependencies
	uses: actions/cache@v4
	with:
	path: build/_deps
	# Include repo name in the key so a repo rename (which changes the
	# absolute work-dir path baked into FetchContent's subbuild cache)
	# invalidates stale caches automatically.
	key: ${{ runner.os }}-${{ matrix.name }}-${{ github.event.repository.name }}-googletest-1.14.0

	- name: Configure
	run: cmake -S . -B build -DGEO_UTILS_CPP_BUILD_TESTS=ON -DGEO_UTILS_CPP_BUILD_EXAMPLES=ON

	- name: Build
	run: cmake --build build --config Release

	- name: Test
	run: ctest --test-dir build -C Release --output-on-failure

Provide feedback