Author (me):
I updated the repo for being much simpler for new user.
Like Dear ImGui, open ./examples/ and if you are in windows/Visual Studio just open:
ImAnim_vs2022_Win64.sln
And chose between win32_dx11, glfw3_opengl3 or sdl2_opengl3
You have *.bat or Makefile in each folder:
glfw_opengl3
sdl2_opengl3
win32_directx11
Enjoy/