Add files

Signed-off-by: Bensuperpc <bensuperpc@gmail.com>

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+
+include(cmake/prelude.cmake)
+
+project(
+    astar
+    VERSION 0.1.0
+    DESCRIPTION "astar"
+    HOMEPAGE_URL "bensuperpc.org"
+    LANGUAGES NONE
+)
+
+include(cmake/project-is-top-level.cmake)
+include(cmake/variables.cmake)
+
+# ---- Declare library ----
+
+add_library(astar_astar INTERFACE)
+add_library(astar::astar ALIAS astar_astar)
+
+set_property(
+    TARGET astar_astar PROPERTY
+    EXPORT_NAME astar
+)
+
+target_include_directories(
+    astar_astar ${warning_guard}
+    INTERFACE
+    "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"
+)
+
+target_compile_features(astar_astar INTERFACE cxx_std_20)
+
+# ---- Install rules ----
+
+if(NOT CMAKE_SKIP_INSTALL_RULES)
+  include(cmake/install-rules.cmake)
+endif()
+
+# ---- Examples ----
+
+if(PROJECT_IS_TOP_LEVEL)
+  option(BUILD_EXAMPLES "Build examples tree." "${astar_DEVELOPER_MODE}")
+  if(BUILD_EXAMPLES)
+    add_subdirectory(example)
+  endif()
+endif()
+
+# ---- Developer mode ----
+
+if(NOT astar_DEVELOPER_MODE)
+  return()
+elseif(NOT PROJECT_IS_TOP_LEVEL)
+  message(
+      AUTHOR_WARNING
+      "Developer mode is intended for developers of astar"
+  )
+endif()
+
+include(cmake/dev-mode.cmake)