Add initial libraries and their respective test code

CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(c-libs LANGUAGES CXX C)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(VERSION_MAJOR 1)
+set(VERSION_MINOR 0)
+
+include(GNUInstallDirs)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY
+  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
+  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
+  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
+set(PROJECT_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+# defines targets and sources
+add_subdirectory(src)
+
+# enable testing and define tests
+enable_testing()
+add_subdirectory(tests)