[Example] Add an Euler equation solver (#796)
[Example] Add an Euler equation solver (#796)

Co-authored-by: Kenneth Lozes <fd8fc7b4496d852ca92f34e6a62e9394e873f230@system76-pc.localdomain>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi