Add CMake, Ninja, and Conan build system support

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

tests/CMakeLists.txt

@@ -0,0 +1,47 @@
+# MetalOS Tests CMakeLists.txt
+# Builds and runs unit tests
+
+cmake_minimum_required(VERSION 3.16)
+
+project(MetalOS_Tests C)
+
+# Find all test source files
+file(GLOB TEST_SOURCES "unit/*.c")
+
+# Include directories
+include_directories(
+    include
+    ../bootloader/include
+    ../kernel/include
+)
+
+# Create a test executable for each test file
+foreach(test_source ${TEST_SOURCES})
+    # Get the test name from the file name
+    get_filename_component(test_name ${test_source} NAME_WE)
+    
+    # Create test executable
+    add_executable(${test_name} ${test_source})
+    
+    # Set compiler flags
+    target_compile_options(${test_name} PRIVATE
+        -Wall
+        -Wextra
+        -std=c11
+    )
+    
+    # Add as a test
+    add_test(NAME ${test_name} COMMAND ${test_name})
+endforeach()
+
+# Custom target to run all tests
+add_custom_target(run_tests
+    COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure
+    DEPENDS ${TEST_SOURCES}
+    COMMENT "Running all tests"
+    VERBATIM
+)
+
+# Print status
+message(STATUS "Tests configuration:")
+message(STATUS "  Test sources: ${TEST_SOURCES}")