Added SDL dependencies as Git submodules

.gitignore

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+build/
+dist/
+.cache
+compile_commands.json

.gitmodules

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+[submodule "extern/SDL2/SDL"]
+	path = extern/SDL2/SDL
+	url = https://github.com/libsdl-org/SDL
+	branch = main
+[submodule "extern/SDL2/SDL_image"]
+	path = extern/SDL2/SDL_image
+	url = https://github.com/libsdl-org/SDL_image
+	branch = main
+[submodule "extern/SDL2/SDL_ttf"]
+	path = extern/SDL2/SDL_ttf
+	url = https://github.com/libsdl-org/SDL_ttf
+	branch = main
+[submodule "extern/SDL2/SDL_mixer"]
+	path = extern/SDL2/SDL_mixer
+	url = https://github.com/libsdl-org/SDL_mixer
+	branch = main

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+project(Engine)
+
+# VARIABLES
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(BUILD_SHARED_LIBS ON)
+
+if(CMAKE_HOST_WIN32)
+	# Export both *.lib and *.dll on Windows
+	set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+endif()
+
+set(CMAKE_INSTALL_BINDIR bin)
+set(CMAKE_INSTALL_LIBDIR lib)
+set(CMAKE_INSTALL_INCLUDEDIR include)
+set(CMAKE_INSTALL_RPATH "$ORIGIN;$ORIGIN/../lib")
+
+# TARGETS
+add_library(${PROJECT_NAME} SHARED src/engine.c)
+
+target_include_directories(${PROJECT_NAME} PUBLIC
+	include
+	extern/SDL2/SDL/include
+	extern/SDL2/SDL_mixer/include
+	extern/SDL2/SDL_image
+	extern/SDL2/SDL_ttf
+)
+target_link_libraries(${PROJECT_NAME} PUBLIC
+	SDL2
+	SDL2_image
+	SDL2_mixer
+	SDL2_ttf
+)
+
+install(TARGETS ${PROJECT_NAME}
+	CONFIGURATIONS Release
+	RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+# SUB-DIRECTORIES
+add_subdirectory(extern)

extern/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+add_subdirectory(SDL2)

extern/SDL2/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+set(SDL_TEST_ENABLED_BY_DEFAULT OFF CACHE BOOL "" FORCE)
+set(SDL2_DISABLE_INSTALL OFF CACHE BOOL "" FORCE)
+set(SDL2_DISABLE_UNINSTALL OFF CACHE BOOL "" FORCE)
+set(SDL2MIXER_VENDORED ON CACHE BOOL "" FORCE)
+set(SDL2TTF_VENDORED ON CACHE BOOL "" FORCE)
+
+add_subdirectory(SDL_image)
+add_subdirectory(SDL_ttf)
+add_subdirectory(SDL_mixer)
+add_subdirectory(SDL)

src/engine.c

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+#include "SDL.h"
+#include "SDL_image.h"
+#include "SDL_mixer.h"
+#include "SDL_ttf.h"
+#include <stdio.h>
+
+void init(void) {
+  if (SDL_Init(SDL_INIT_EVERYTHING) == 0) {
+    printf("SDL initialiased successfully\n");
+  }
+}