Added cmake support (#11)

* Update README.md

* added submodules

* moved submodules to release tag

* fix include for fixed width integer

* added cmake support and build instruction

* Update README.md

* fix cmake links

* upd CMakeLists.txt

CMakeLists.txt

@@ -0,0 +1,35 @@
+cmake_minimum_required(VERSION 3.15)
+project(VoxelEngine)
+
+file(GLOB_RECURSE HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/src/*.hpp)
+file(GLOB_RECURSE SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp)
+
+add_executable(${PROJECT_NAME} ${HEADERS} ${SOURCES})
+target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_17)
+
+option(VE_USE_SYSTEM_LIBS "Use system installed libraries" ON)
+
+find_package(OpenGL REQUIRED)
+find_package(GLEW REQUIRED)
+find_package(OpenAL REQUIRED)
+find_package(PNG REQUIRED)
+
+set(LIBS "")
+if(NOT VE_USE_SYSTEM_LIBS)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/libs/glfw)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/libs/glm)
+    set(LIBS glm)
+else()
+    find_package(glfw3 REQUIRED)
+    find_package(glm REQUIRED)
+endif(NOT VE_USE_SYSTEM_LIBS)
+
+if(UNIX)
+    find_package(Threads REQUIRED)
+    set(LIBS ${LIBS} Threads::Threads)
+endif(UNIX)
+
+
+target_link_libraries(${PROJECT_NAME} ${LIBS} glfw OpenGL::GL ${OPENAL_LIBRARY} GLEW::GLEW PNG::PNG)
+
+file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/res DESTINATION ${CMAKE_CURRENT_SOURCE_DIR}/build)