Set up initial CMake skeleton

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure
+        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+
+      - name: Build
+        run: cmake --build build --config Release
+
+      - name: Test
+        run: ctest --test-dir build --output-on-failure

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(box3cpp
+    VERSION 0.1.0
+    DESCRIPTION "Small C++20 RAII wrapper for Box3D"
+    LANGUAGES CXX
+)
+
+add_library(box3cpp INTERFACE)
+add_library(box3cpp::box3cpp ALIAS box3cpp)
+
+target_compile_features(box3cpp INTERFACE cxx_std_20)
+
+target_include_directories(box3cpp
+    INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:include>
+)
+
+option(BOX3CPP_BUILD_EXAMPLES "Build box3cpp examples" ON)
+
+if(BOX3CPP_BUILD_EXAMPLES)
+    add_executable(box3cpp_hello examples/hello_box3cpp.cpp)
+    target_link_libraries(box3cpp_hello PRIVATE box3cpp::box3cpp)
+endif()
+
+option(BOX3CPP_BUILD_TESTS "Build box3cpp tests" ON)
+
+if(BOX3CPP_BUILD_TESTS)
+    enable_testing()
+
+    add_executable(box3cpp_smoke_test tests/smoke_test.cpp)
+    target_link_libraries(box3cpp_smoke_test PRIVATE box3cpp::box3cpp)
+
+    add_test(NAME box3cpp_smoke_test COMMAND box3cpp_smoke_test)
+endif()

examples/hello_box3cpp.cpp

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+#include <box3cpp/box3cpp.hpp>
+
+#include <iostream>
+
+int main() {
+    std::cout << "box3cpp " << box3cpp::version_string << '\n';
+    return 0;
+}

include/box3cpp/box3cpp.hpp

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+#pragma once
+
+#include <box3cpp/version.hpp>

include/box3cpp/version.hpp

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+#pragma once
+
+namespace box3cpp {
+
+inline constexpr int version_major = 0;
+inline constexpr int version_minor = 1;
+inline constexpr int version_patch = 0;
+
+inline constexpr const char* version_string = "0.1.0";
+
+} // namespace box3cpp

tests/smoke_test.cpp

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+#include <box3cpp/box3cpp.hpp>
+
+int main() {
+    static_assert(box3cpp::version_major == 0);
+    static_assert(box3cpp::version_minor == 1);
+    static_assert(box3cpp::version_patch == 0);
+
+    return 0;
+}