first try with cmake and imgui

CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.16.3)
+
+project(shadps4)
+
+include_directories(third-party/)
+include_directories(third-party/imgui/)
+include_directories(third-party/imgui/backends)
+include_directories(third-party/sdl/)
+
+add_subdirectory("third-party")
+
+#=================== EXAMPLE ===================
+
+add_executable(shadps4
+    src/main.cpp
+)
+
+find_package(OpenGL REQUIRED)
+
+target_link_libraries(shadps4 PUBLIC IMGUI SDL3-shared ${OPENGL_LIBRARY})