Add support CMake build

CMakeLists.txt

@@ -0,0 +1,55 @@
+cmake_minimum_required(VERSION 3.11)
+project(gumbo)
+
+set(CMAKE_CXX_STANDARD 17)
+
+file(GLOB HEADERS_FILES 
+		src/*.h
+		)
+
+file(GLOB EXPORT_HEADERS_FILES
+        src/gumbo.h
+        src/tag_enum.h
+        )
+
+if(MSVC)
+    list(APPEND EXPORT_HEADERS_FILES visualc/include/strings.h)
+endif()
+
+file(INSTALL ${EXPORT_HEADERS_FILES} DESTINATION ${CMAKE_BINARY_DIR}/include/gumbo)		
+
+file(GLOB SOURCES_FILES 
+		src/*.c
+		)
+
+add_library(gumbo STATIC
+        ${HEADERS_FILES}
+        ${SOURCES_FILES}
+        )
+
+target_include_directories(gumbo
+        PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/include>
+        $<INSTALL_INTERFACE:include>
+        # For support include different way. (gumbo/gumbo.h or gumbo.h)
+        $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/include/gumbo>
+        $<INSTALL_INTERFACE:include/gumbo>
+        )
+
+install(FILES ${EXPORT_HEADERS_FILES} 
+        DESTINATION ${CMAKE_INSTALL_PREFIX}/include/gumbo
+        )
+
+install(
+        TARGETS gumbo
+        EXPORT "${TARGETS_EXPORT_NAME}"
+        LIBRARY DESTINATION "lib"
+        ARCHIVE DESTINATION "lib"
+        RUNTIME DESTINATION "bin"
+        INCLUDES DESTINATION "include/gumbo"
+        )
+
+option(BUILD_GUMBO_TESTS "Builds gumbo tests" OFF)
+if(BUILD_GUMBO_TESTS)
+        add_subdirectory(tests)
+endif()

tests/CMakeLists.txt

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+set(GTEST_ROOT "${CMAKE_INSTALL_PREFIX}/")
+find_package(GTest REQUIRED)
+
+add_executable(gumbo_tests
+        test_utils.h
+        attribute.cc
+        char_ref.cc
+        parser.cc
+        string_buffer.cc
+        string_piece.cc
+        test_utils.cc
+        tokenizer.cc
+        utf8.cc
+        vector.cc
+        )
+
+target_include_directories(gumbo_tests
+        PRIVATE
+        "${PROJECT_SOURCE_DIR}/src"
+        )
+
+target_link_libraries(gumbo_tests
+        PRIVATE
+        GTest::GTest
+        GTest::Main
+        gumbo
+        )