Add documentation of the projects

README.md

projects/CMakeLists.txt

projects/bindless_textures/README.md

projects/fire_works/README.md

projects/first_mesh/README.md

projects/first_scene/README.md

projects/first_triangle/README.md

projects/head_demo/README.md

projects/head_demo/src/main.cpp

projects/indirect_dispatch/README.md

projects/indirect_draw/README.md

projects/mesh_shader/README.md

projects/mpm/.gitignore

projects/mpm/CMakeLists.txt

projects/mpm/README.md

projects/mpm/shaders/.gitignore

projects/mpm/shaders/grid.frag

projects/mpm/shaders/grid.vert

projects/mpm/shaders/init_particle_weights.comp

projects/mpm/shaders/lines.frag