Write simple CMake build config

CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(batomorph LANGUAGES C)
+
+macro(configure_target target)
+  set_property(TARGET ${target} PROPERTY C_STANDARD 23)
+  set_property(TARGET ${target} PROPERTY C_EXTENSIONS OFF)
+  target_compile_options(${target} PRIVATE -Wall -Wextra -pedantic)
+endmacro()
+
+add_library(batomorph
+  src/ff.c
+)
+configure_target(batomorph)
+target_include_directories(batomorph PUBLIC include)
+
+add_executable(demo
+  demo.c
+)
+configure_target(demo)
+target_link_libraries(demo PRIVATE batomorph m)