Implement structure and first functionality

.github/workflows/tests.yml

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+name: tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install package
+        run: python -m pip install -v ".[test]"
+      - name: Test import
+        run: python -c "import bioimage_cpp"
+      - name: Run tests
+        run: pytest -q

.github/workflows/wheels.yml

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+name: wheels
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  wheels:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-13, macos-14, windows-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pypa/cibuildwheel@v2.18
+        env:
+          CIBW_BUILD: "cp310-* cp311-* cp312-*"
+          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_COMMAND: "python -c \"import bioimage_cpp\" && pytest {project}/tests"

.gitignore

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+# Python caches
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Python packaging/build outputs
+*.egg-info/
+build/
+dist/
+wheelhouse/
+
+# scikit-build-core / CMake outputs
+_skbuild/
+CMakeFiles/
+CMakeCache.txt
+cmake_install.cmake
+compile_commands.json
+
+# Test and coverage artifacts
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Local virtual environments
+.venv/
+venv/