distribute CMakeLists.txt for directory sample and simulate

Hi,

I'm a student and I'm trying to use the MuJoCo precompiled library.

Starting with version 3.2.0, [mujoco deleted the Makefile files in the simulate and sample folders](https://github.com/google-deepmind/mujoco/commit/1601ab60781f57885b4ace100660438e56d738f2). Now these folders contain only the "cmake" subfolder without a CMakeLists.txt file and users cannot compile them from source. And simply copying the corresponding "CMakeLists.txt" from MuJoCo source does not work. cmake will not find mujoco as a library.

So, may I ask two questions:
1. Why doesn't MuJoCo distribute its `cmake` directory, which is located in directory `lib` if mujoco is installed from source?
2. How does MuJoCo generate its release files?