add demo

CMakeLists.txt

@@ -82,3 +82,7 @@ set(public_headers
 
 file(COPY ${public_headers} DESTINATION "include")
 
+add_executable(main demo.cpp)
+target_link_libraries(main raylib imgui)
+target_include_directories(main PRIVATE build/include/)
+

demo.cpp

@@ -0,0 +1,39 @@
+#include <raylib.h>
+#include <imgui.h>
+#include <rlImGui.h>
+
+int main(int argc, char *argv[])
+{
+  int screenWidth = 1000;
+  int screenHeight = 1000;
+
+  SetConfigFlags(FLAG_WINDOW_RESIZABLE);
+  InitWindow(screenWidth, screenHeight, "VIEW");
+  SetTargetFPS(60);
+  rlImGuiSetup(true);
+  bool showDemoWindow = true;
+  ImGui::GetIO().ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+  while (!WindowShouldClose())
+  {
+    BeginDrawing();
+    rlImGuiBegin();
+    ImGui::DockSpaceOverViewport(0,  NULL, ImGuiDockNodeFlags_PassthruCentralNode);
+    ClearBackground(RAYWHITE);
+    if (ImGui::BeginMainMenuBar())
+    {
+      if (ImGui::MenuItem("Demo Window", nullptr, showDemoWindow))
+        showDemoWindow = !showDemoWindow;
+
+      ImGui::EndMainMenuBar();
+    }
+
+    if (showDemoWindow)
+      ImGui::ShowDemoWindow(&showDemoWindow);
+    rlImGuiEnd();
+    EndDrawing();
+  }
+  rlImGuiShutdown();
+  CloseWindow();
+  return 0;
+}